- tz - lists.iana.org

[PROPOSED] Simplify zic's handling of -r
by Paul Eggert Sept. 13, 2021

Sept. 13, 2021

This is refactoring; it should not affect user-visible behavior. * zic.c (struct timerange): New member pretrans. (limitrange): New arg locut. Use it to set r.pretrans. All callers changed. (writezone): Initialize the new member, to avoid undefined behavior. Simplify by using the new member. --- zic.c | 70 +++++++++++++++++++++++++++++------------------------------ 1 file changed, 34 insertions(+), 36 deletions(-) diff --git a/zic.c b/zic.c index a4406cb..e2a7e13 100644 --- a/zic.c +++ b/zic.c @@ -1958,29 +1958,44 @@ struct timerange { int defaulttype; ptrdiff_t base, count; int leapbase, leapcount; - bool leapexpiry; + bool pretrans, leapexpiry; }; static struct timerange -limitrange(struct timerange r, zic_t lo, zic_t hi, +limitrange(struct timerange r, bool locut, zic_t lo, zic_t hi, zic_t const *ats, unsigned char const *types) { + /* Omit ordinary transitions < LO. */ while (0 < r.count && ats[r.base] < lo) { r.defaulttype = types[r.base]; r.count--; r.base++; } + + /* Omit as many leap seconds < LO as possible, such that the first + leap second in the truncated list is <= LO. */ while (1 < r.leapcount && trans[r.leapbase + 1] <= lo) { r.leapcount--; r.leapbase++; } + /* Omit ordinary and leap second transitions greater than HI + 1. */ if (hi < ZIC_MAX) { while (0 < r.count && hi + 1 < ats[r.base + r.count - 1]) r.count--; while (0 < r.leapcount && hi + 1 < trans[r.leapbase + r.leapcount - 1]) r.leapcount--; } + + /* Determine whether to keep the last too-low transition if no + transition is exactly at LO. The kept transition will be output + as a LO "transition"; see "Output a LO_TIME transition" below. + This is needed when the output is truncated at the start, and is + also useful when catering to buggy 32-bit clients that do not use + time type 0 for timestamps before the first transition. */ + r.pretrans = locut && ! (r.count && ats[r.base] == lo); + + /* Determine whether to append an expiration to the leap second table. */ r.leapexpiry = 0 <= leapexpires && leapexpires - 1 <= hi; return r; @@ -2092,9 +2107,11 @@ writezone(const char *const name, const char *const string, char version, rangeall.base = rangeall.leapbase = 0; rangeall.count = timecnt; rangeall.leapcount = leapcnt; - rangeall.leapexpiry = false; - range64 = limitrange(rangeall, lo_time, hi_time, ats, types); - range32 = limitrange(range64, INT32_MIN, INT32_MAX, ats, types); + rangeall.pretrans = rangeall.leapexpiry = false; + range64 = limitrange(rangeall, min_time < lo_time, + lo_time, hi_time, ats, types); + range32 = limitrange(range64, INT32_MIN < lo_time, + INT32_MIN, INT32_MAX, ats, types); /* TZif version 4 is needed if a no-op transition is appended to indicate the expiration of the leap second table, or if the first @@ -2129,7 +2146,7 @@ writezone(const char *const name, const char *const string, char version, register int thisleapi, thisleapcnt, thisleaplim; struct tzhead tzh; int currenttype, thisdefaulttype; - bool locut, hicut, thisleapexpiry; + bool hicut, pretrans, thisleapexpiry; zic_t lo; int old0; char omittype[TZ_MAX_TYPES]; @@ -2160,8 +2177,8 @@ writezone(const char *const name, const char *const string, char version, toomanytimes = thistimecnt >> 31 >> 1 != 0; thisleapi = range32.leapbase; thisleapcnt = range32.leapcount; + pretrans = range32.pretrans; thisleapexpiry = range32.leapexpiry; - locut = INT32_MIN < lo_time; hicut = hi_time < INT32_MAX; } else { thisdefaulttype = range64.defaulttype; @@ -2170,33 +2187,17 @@ writezone(const char *const name, const char *const string, char version, toomanytimes = thistimecnt >> 31 >> 31 >> 2 != 0; thisleapi = range64.leapbase; thisleapcnt = range64.leapcount; + pretrans = range64.pretrans; thisleapexpiry = range64.leapexpiry; - locut = min_time < lo_time; hicut = hi_time < max_time; } if (toomanytimes) error(_("too many transition times")); - /* Keep the last too-low transition if no transition is - exactly at LO. The kept transition will be output as - a LO "transition"; see "Output a LO_TIME transition" - below. This is needed when the output is truncated at - the start, and is also useful when catering to buggy - 32-bit clients that do not use time type 0 for - timestamps before the first transition. */ - if (0 < thistimei && ats[thistimei] != lo_time) { - thistimei--; - thistimecnt++; - locut = false; - } - thistimelim = thistimei + thistimecnt; - if (thistimecnt != 0) { - if (ats[thistimei] == lo_time) - locut = false; - if (hi_time < ZIC_MAX && ats[thistimelim - 1] == hi_time + 1) - hicut = false; - } + if (thistimecnt && hi_time < ZIC_MAX + && ats[thistimelim - 1] == hi_time + 1) + hicut = false; memset(omittype, true, typecnt); omittype[thisdefaulttype] = false; for (i = thistimei; i < thistimelim; i++) @@ -2291,11 +2292,9 @@ writezone(const char *const name, const char *const string, char version, indmap[desigidx[i]] = j; } if (pass == 1 && !want_bloat()) { - thisleapcnt = 0; - thisleapexpiry = false; - thistimecnt = - (locut + hicut); + pretrans = hicut = thisleapexpiry = false; + thistimecnt = thisleapcnt = 0; thistypecnt = thischarcnt = 1; - thistimelim = thistimei; } #define DO(field) fwrite(tzh.field, sizeof tzh.field, 1, fp) memset(&tzh, 0, sizeof tzh); @@ -2304,7 +2303,7 @@ writezone(const char *const name, const char *const string, char version, convert(utcnt, tzh.tzh_ttisutcnt); convert(stdcnt, tzh.tzh_ttisstdcnt); convert(thisleapcnt + thisleapexpiry, tzh.tzh_leapcnt); - convert(locut + thistimecnt + hicut, tzh.tzh_timecnt); + convert(pretrans + thistimecnt + hicut, tzh.tzh_timecnt); convert(thistypecnt, tzh.tzh_typecnt); convert(thischarcnt, tzh.tzh_charcnt); DO(tzh_magic); @@ -2331,16 +2330,15 @@ writezone(const char *const name, const char *const string, char version, for this pass. */ lo = pass == 1 && lo_time < INT32_MIN ? INT32_MIN : lo_time; - if (locut) + if (pretrans) puttzcodepass(lo, fp, pass); for (i = thistimei; i < thistimelim; ++i) { - zic_t at = ats[i] < lo ? lo : ats[i]; - puttzcodepass(at, fp, pass); + puttzcodepass(ats[i], fp, pass); } if (hicut) puttzcodepass(hi_time + 1, fp, pass); currenttype = 0; - if (locut) + if (pretrans) putc(currenttype, fp); for (i = thistimei; i < thistimelim; ++i) { currenttype = typemap[types[i]]; -- 2.31.1

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[PATCH] Use https: for opengroup in zic.8
by Paul Eggert Sept. 12, 2021

Sept. 12, 2021

--- zic.8 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/zic.8 b/zic.8 index 800fb8b..b77841b 100644 --- a/zic.8 +++ b/zic.8 @@ -252,7 +252,7 @@ zero or more lines, each ending in a newline byte and containing at most 511 bytes, and without any NUL bytes. The input text's encoding is typically UTF-8 or ASCII; it should have a unibyte representation for the POSIX Portable Character Set (PPCS) -\*<http://pubs\*:.opengroup\*:.org/\*:onlinepubs/\*:9699919799/\*:basedefs/\*:…> +\*<https://pubs\*:.opengroup\*:.org/\*:onlinepubs/\*:9699919799/\*:basedefs/\*…> and the encoding's non-unibyte characters should consist entirely of non-PPCS bytes. Non-PPCS characters typically occur only in comments: although output file names and time zone abbreviations can contain -- 2.31.1

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[PATCH] Port ‘check_time_t_alternatives’ to oddball hosts
by Paul Eggert Sept. 12, 2021

Sept. 12, 2021

* Makefile (TIME_T_ALTERNATIVES): Use int_least64_t instead of int64_t, as int64_t is not required by the C standard. Similarly for int32_t, uint32_t, uint64_t. --- Makefile | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Makefile b/Makefile index b00ac05..8a7436a 100644 --- a/Makefile +++ b/Makefile @@ -122,8 +122,8 @@ LIBDIR = $(TOPDIR)/$(USRDIR)/lib # Types to try, as an alternative to time_t. TIME_T_ALTERNATIVES = $(TIME_T_ALTERNATIVES_HEAD) $(TIME_T_ALTERNATIVES_TAIL) -TIME_T_ALTERNATIVES_HEAD = int64_t -TIME_T_ALTERNATIVES_TAIL = int32_t uint32_t uint64_t +TIME_T_ALTERNATIVES_HEAD = int_least64_t +TIME_T_ALTERNATIVES_TAIL = int_least32_t uint_least32_t uint_least64_t # What kind of TZif data files to generate. (TZif is the binary time # zone data format that zic generates; see Internet RFC 8536.) @@ -976,7 +976,7 @@ $(TIME_T_ALTERNATIVES): $(VERSION_DEPS) mkdir $@.dir ln $(VERSION_DEPS) $@.dir case $@ in \ - int32_t) range=-2147483648,2147483648;; \ + int*32_t) range=-2147483648,2147483648;; \ u*) range=0,4294967296;; \ *) range=-4294967296,4294967296;; \ esac && \ -- 2.31.1

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request
by Cool Gab19 Sept. 12, 2021

Sept. 12, 2021

I request Etc/GMT-15 or +15 be included in your database https://github.com/gabtimezone15/tz/blob/d0970deeac9041a1e8a585782ccec3a1ef…

2 2

[PROPOSED] Omit some casts
by Paul Eggert Sept. 11, 2021

Sept. 11, 2021

* localtime.c (getsecs, localsub, timesub): * strftime.c (_fmt): * zdump.c (dumptime): * zic.c (rcomp, atcomp): Rely on automatic conversions instead of casts, which are more error-prone. --- localtime.c | 13 +++++++------ strftime.c | 12 +++++++----- zdump.c | 17 ++++++----------- zic.c | 11 +++++------ 4 files changed, 25 insertions(+), 28 deletions(-) diff --git a/localtime.c b/localtime.c index cc972ef..88fd35d 100644 --- a/localtime.c +++ b/localtime.c @@ -862,6 +862,7 @@ static const char * getsecs(register const char *strp, int_fast32_t *const secsp) { int num; + int_fast32_t secsperhour = SECSPERHOUR; /* ** 'HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like @@ -872,7 +873,7 @@ getsecs(register const char *strp, int_fast32_t *const secsp) strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); if (strp == NULL) return NULL; - *secsp = num * (int_fast32_t) SECSPERHOUR; + *secsp = num * secsperhour; if (*strp == ':') { ++strp; strp = getnum(strp, &num, 0, MINSPERHOUR - 1); @@ -1544,7 +1545,7 @@ localsub(struct state const *sp, time_t const *timep, int_fast32_t setname, hi = mid; else lo = mid + 1; } - i = (int) sp->types[lo - 1]; + i = sp->types[lo - 1]; } ttisp = &sp->ttis[i]; /* @@ -1757,18 +1758,18 @@ timesub(const time_t *timep, int_fast32_t offset, tmp->tm_wday %= DAYSPERWEEK; if (tmp->tm_wday < 0) tmp->tm_wday += DAYSPERWEEK; - tmp->tm_hour = (int) (rem / SECSPERHOUR); + tmp->tm_hour = rem / SECSPERHOUR; rem %= SECSPERHOUR; - tmp->tm_min = (int) (rem / SECSPERMIN); + tmp->tm_min = rem / SECSPERMIN; /* ** A positive leap second requires a special ** representation. This uses "... ??:59:60" et seq. */ - tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; + tmp->tm_sec = rem % SECSPERMIN + hit; ip = mon_lengths[isleap(y)]; for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) idays -= ip[tmp->tm_mon]; - tmp->tm_mday = (int) (idays + 1); + tmp->tm_mday = idays + 1; tmp->tm_isdst = 0; #ifdef TM_GMTOFF tmp->TM_GMTOFF = offset; diff --git a/strftime.c b/strftime.c index 4f871cd..5273155 100644 --- a/strftime.c +++ b/strftime.c @@ -335,11 +335,13 @@ label: && tm.tm_sec == tm_1.tm_sec)) return NULL; } - if (TYPE_SIGNED(time_t)) - sprintf(buf, "%"PRIdMAX, - (intmax_t) mkt); - else sprintf(buf, "%"PRIuMAX, - (uintmax_t) mkt); + if (TYPE_SIGNED(time_t)) { + intmax_t n = mkt; + sprintf(buf, "%"PRIdMAX, n); + } else { + uintmax_t n = mkt; + sprintf(buf, "%"PRIuMAX, n); + } pt = _add(buf, pt, ptlim); } continue; diff --git a/zdump.c b/zdump.c index 9d22b26..e198b04 100644 --- a/zdump.c +++ b/zdump.c @@ -1155,8 +1155,6 @@ dumptime(register const struct tm *timeptr) "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; - register const char * wn; - register const char * mn; register int lead; register int trail; @@ -1169,16 +1167,13 @@ dumptime(register const struct tm *timeptr) ** values in tm_wday or tm_mon, but since this code might be compiled ** with other (perhaps experimental) versions, paranoia is in order. */ - if (timeptr->tm_wday < 0 || timeptr->tm_wday >= - (int) (sizeof wday_name / sizeof wday_name[0])) - wn = "???"; - else wn = wday_name[timeptr->tm_wday]; - if (timeptr->tm_mon < 0 || timeptr->tm_mon >= - (int) (sizeof mon_name / sizeof mon_name[0])) - mn = "???"; - else mn = mon_name[timeptr->tm_mon]; printf("%s %s%3d %.2d:%.2d:%.2d ", - wn, mn, + ((0 <= timeptr->tm_wday + && timeptr->tm_wday < sizeof wday_name / sizeof wday_name[0]) + ? wday_name[timeptr->tm_wday] : "???"), + ((0 <= timeptr->tm_mon + && timeptr->tm_mon < sizeof mon_name / sizeof mon_name[0]) + ? mon_name[timeptr->tm_mon] : "???"), timeptr->tm_mday, timeptr->tm_hour, timeptr->tm_min, timeptr->tm_sec); #define DIVISOR 10 diff --git a/zic.c b/zic.c index 4c55f1c..a4406cb 100644 --- a/zic.c +++ b/zic.c @@ -1225,8 +1225,8 @@ itssymlink(char const *name) static int rcomp(const void *cp1, const void *cp2) { - return strcmp(((const struct rule *) cp1)->r_name, - ((const struct rule *) cp2)->r_name); + struct rule const *r1 = cp1, *r2 = cp2; + return strcmp(r1->r_name, r2->r_name); } static void @@ -1949,10 +1949,9 @@ puttzcodepass(zic_t val, FILE *fp, int pass) static int atcomp(const void *avp, const void *bvp) { - const zic_t a = ((const struct attype *) avp)->at; - const zic_t b = ((const struct attype *) bvp)->at; - - return (a < b) ? -1 : (a > b); + struct attype const *ap = avp, *bp = bvp; + zic_t a = ap->at, b = bp->at; + return a < b ? -1 : a > b; } struct timerange { -- 2.31.1

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[PATCH] Fix tzfile.h comment
by Paul Eggert Sept. 11, 2021

Sept. 11, 2021

* tzfile.h (struct tzhead): Update comment for version 4. --- tzfile.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tzfile.h b/tzfile.h index ee91104..9c3ea4e 100644 --- a/tzfile.h +++ b/tzfile.h @@ -44,7 +44,7 @@ struct tzhead { char tzh_magic[4]; /* TZ_MAGIC */ - char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ + char tzh_version[1]; /* '\0' or '2'-'4' as of 2021 */ char tzh_reserved[15]; /* reserved; must be zero */ char tzh_ttisutcnt[4]; /* coded number of trans. time flags */ char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ -- 2.31.1

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[PATCH] Change is_digit from macro to function
by Paul Eggert Sept. 11, 2021

Sept. 11, 2021

This is cleaner and should be no slower with modern optimizers. * localtime.c, zdump.c (is_digit): New static function, replacing the old macro. * private.h (is_digit): Remove this macro. --- localtime.c | 7 +++++++ private.h | 3 --- zdump.c | 8 ++++++-- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/localtime.c b/localtime.c index 5f362d4..cc972ef 100644 --- a/localtime.c +++ b/localtime.c @@ -778,6 +778,13 @@ static const int year_lengths[2] = { DAYSPERNYEAR, DAYSPERLYEAR }; +/* Is C an ASCII digit? */ +static bool +is_digit(char c) +{ + return '0' <= c && c <= '9'; +} + /* ** Given a pointer into a timezone string, scan until a character that is not ** a valid character in a time zone abbreviation is found. diff --git a/private.h b/private.h index 98ead55..4c03324 100644 --- a/private.h +++ b/private.h @@ -225,9 +225,6 @@ #define R_OK 4 #endif /* !defined R_OK */ -/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */ -#define is_digit(c) ((unsigned)(c) - '0' <= 9) - /* ** Define HAVE_STDINT_H's default value here, rather than at the ** start, since __GLIBC__ and INTMAX_MAX's values depend on diff --git a/zdump.c b/zdump.c index 3c71894..9d22b26 100644 --- a/zdump.c +++ b/zdump.c @@ -99,8 +99,12 @@ static void showtrans(char const *, struct tm const *, time_t, char const *, static const char *tformat(void); static time_t yeartot(intmax_t) ATTRIBUTE_PURE; -/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */ -#define is_digit(c) ((unsigned)(c) - '0' <= 9) +/* Is C an ASCII digit? */ +static bool +is_digit(char c) +{ + return '0' <= c && c <= '9'; +} /* Is A an alphabetic character in the C locale? */ static bool -- 2.31.1

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[PROPOSED] Relax leap-second pickiness
by Paul Eggert Sept. 10, 2021

Sept. 10, 2021

* localtime.c (tzloadbody): Relax requirements on the leap second table in a TZif file, to accommodate truncation at the start that is less than 28 days before a leap second, or (unlikely, though theoretically possible) expiration less than 28 days after the last leap second. --- localtime.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/localtime.c b/localtime.c index e4f1a87..5f362d4 100644 --- a/localtime.c +++ b/localtime.c @@ -436,7 +436,7 @@ tzloadbody(char const *name, struct state *sp, bool doextend, for (stored = 4; stored <= 8; stored *= 2) { int_fast32_t ttisstdcnt = detzcode(up->tzhead.tzh_ttisstdcnt); int_fast32_t ttisutcnt = detzcode(up->tzhead.tzh_ttisutcnt); - int_fast64_t prevtr = 0; + int_fast64_t prevtr = -1; int_fast32_t prevcorr; int_fast32_t leapcnt = detzcode(up->tzhead.tzh_leapcnt); int_fast32_t timecnt = detzcode(up->tzhead.tzh_timecnt); @@ -526,24 +526,21 @@ tzloadbody(char const *name, struct state *sp, bool doextend, int_fast64_t tr = stored == 4 ? detzcode(p) : detzcode64(p); int_fast32_t corr = detzcode(p + stored); p += stored + 4; - /* Leap seconds cannot occur before the Epoch. */ - if (tr < 0) + /* Leap seconds cannot occur before the Epoch, + or out of order. */ + if (tr <= prevtr) return EINVAL; if (tr <= TIME_T_MAX) { - /* Leap seconds cannot occur more than once per UTC month, - and UTC months are at least 28 days long (minus 1 - second for a negative leap second). Each leap second's + /* To avoid other botches in this code, each leap second's correction must differ from the previous one's by 1 second or less, except that the first correction can be any value; these requirements are more generous than RFC 8536, to allow future RFC extensions. */ - if (tr - prevtr < 28 * SECSPERDAY - 1 - || ((timecnt == 0 || sp->ats[0] < tr) - && ! (i == 0 - || (prevcorr < corr - ? corr == prevcorr + 1 - : (corr == prevcorr - || corr == prevcorr - 1))))) + if (! (i == 0 + || (prevcorr < corr + ? corr == prevcorr + 1 + : (corr == prevcorr + || corr == prevcorr - 1)))) return EINVAL; sp->lsis[leapcnt].ls_trans = prevtr = tr; sp->lsis[leapcnt].ls_corr = prevcorr = corr; -- 2.31.1

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Format for Asia/Bangkok
by Danilo Spinella Sept. 10, 2021

Sept. 10, 2021

Hi there! I have noticed that the format for the zone Asia/Bangkok is shown as "+07" instead of Indochina Time (ICT), Western Indonesian Time (WIB) or Thailand Standard Time (THA). Is this because none of the above is standard? Best Regards, Danilo Spinella

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[PATCH] White space fixes
by Paul Eggert Sept. 10, 2021

Sept. 10, 2021

--- localtime.c | 2 +- zdump.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/localtime.c b/localtime.c index a70b67a..e4f1a87 100644 --- a/localtime.c +++ b/localtime.c @@ -2379,7 +2379,7 @@ time(time_t *p) if (r != (time_t) -1) { int_fast32_t offset = EPOCH_LOCAL ? (daylight ? timezone : altzone) : 0; if (increment_overflow32(&offset, -EPOCH_OFFSET) - || increment_overflow_time (&r, offset)) { + || increment_overflow_time(&r, offset)) { errno = EOVERFLOW; r = -1; } diff --git a/zdump.c b/zdump.c index f2ff442..3c71894 100644 --- a/zdump.c +++ b/zdump.c @@ -73,7 +73,7 @@ extern int optind; #endif /* The minimum and maximum finite time values. */ -enum { atime_shift = CHAR_BIT * sizeof (time_t) - 2 }; +enum { atime_shift = CHAR_BIT * sizeof(time_t) - 2 }; static time_t const absolute_min_time = ((time_t) -1 < 0 ? (- ((time_t) ~ (time_t) 0 < 0) -- 2.30.2

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Re: [tz] ICANN News Alert - ICANN to Manage Time Zone Database
by Parsam Parham Sept. 10, 2021

Sept. 10, 2021

=======

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Timezone change detection
by Edward Tomasz Napierała Sept. 4, 2021

Sept. 4, 2021

Hello. I'm working on upstreaming a patch, which originally came from NetApp, to modify localtime.c to automatically detect changes to the time zone. The use case is to make the applications handle moving between timezones, or changing the default system timezone. The idea is pretty simple: just stat(2) the timezone file inode to make sure it still refers to the same file it previously did, and make sure to do this at most once per minute. The patch (with the FreeBSD-specific build glue stripped) follows; previous discussion can be found at https://reviews.freebsd.org/D30183. The patch was written for FreeBSD version of localtime.c, which differs a bit from upstream, but as there seems to be an effort underway to sync FreeBSD with upstream, I believe it also makes sense to ask for comments here before commiting it to FreeBSD. Any feedback is welcome. Thanks :-) diff --git a/contrib/tzcode/stdtime/localtime.c b/contrib/tzcode/stdtime/localtime.c index e221c1fa396..926b24470e1 100644 --- a/contrib/tzcode/stdtime/localtime.c +++ b/contrib/tzcode/stdtime/localtime.c @@ -354,6 +354,45 @@ settzname(void) } } +#ifdef DETECT_TZ_CHANGES +/* + * Determine if there's a change in the timezone since the last time we checked. + * Returns: -1 on error + * 0 if the timezone has not changed + * 1 if the timezone has changed + */ +static int +change_in_tz(const char *name) +{ + static char old_name[PATH_MAX]; + static struct stat old_sb; + struct stat sb; + int error; + + error = stat(name, &sb); + if (error != 0) + return -1; + + if (strcmp(name, old_name) != 0) { + strlcpy(old_name, name, sizeof(old_name)); + old_sb = sb; + return 1; + } + + if (sb.st_dev != old_sb.st_dev || + sb.st_ino != old_sb.st_ino || + sb.st_ctime != old_sb.st_ctime || + sb.st_mtime != old_sb.st_mtime) { + old_sb = sb; + return 1; + } + + return 0; +} +#else /* !DETECT_TZ_CHANGES */ +#define change_in_tz(X) 0 +#endif /* !DETECT_TZ_CHANGES */ + static int differ_by_repeat(const time_t t1, const time_t t0) { @@ -379,6 +418,7 @@ register const int doextend; int stored; int nread; int res; + int ret; union { struct tzhead tzhead; char buf[2 * sizeof(struct tzhead) + @@ -427,6 +467,22 @@ register const int doextend; (void) strcat(fullname, name); name = fullname; } + if (doextend == TRUE) { + /* + * Detect if the timezone file has changed. Check + * 'doextend' to ignore TZDEFRULES; the change_in_tz() + * function can only keep state for a single file. + */ + ret = change_in_tz(name); + if (ret <= 0) { + /* + * Returns -1 if there was an error, + * and 0 if the timezone had not changed. + */ + free(fullname); + return ret; + } + } if ((fid = _open(name, OPEN_MODE)) == -1) { free(fullname); return -1; @@ -1209,12 +1265,43 @@ gmtload(struct state *const sp) (void) tzparse(gmt, sp, TRUE); } +#ifdef DETECT_TZ_CHANGES +static int +recheck_tzdata() +{ + static time_t last_checked; + struct timespec now; + time_t current_time; + int error; + + /* + * We want to recheck the timezone file every 61 sec. + */ + error = clock_gettime(CLOCK_MONOTONIC, &now); + if (error <= 0) { + /* XXX: Can we somehow report this? */ + return 0; + } + + current_time = now.tv_sec; + if ((current_time - last_checked > 61) || + (last_checked > current_time)) { + last_checked = current_time; + return 1; + } + + return 0; +} +#else /* !DETECT_TZ_CHANGES */ +#define recheck_tzdata() 0 +#endif /* !DETECT_TZ_CHANGES */ + static void tzsetwall_basic(int rdlocked) { if (!rdlocked) _RWLOCK_RDLOCK(&lcl_rwlock); - if (lcl_is_set < 0) { + if (lcl_is_set < 0 && recheck_tzdata() == 0) { if (!rdlocked) _RWLOCK_UNLOCK(&lcl_rwlock); return;

5 10

New tzexplorer.org website
by Kerry Shetline Sept. 2, 2021

Sept. 2, 2021

I’ve created a new website, http://tzexplorer.org <http://tzexplorer.org/>, that makes it easy to do conversions among IANA timezones and other time standards like TAI, view the history of time transitions in any timezone, and download TZ code and data in .zip format. There are also links to open-source JavaScript code for the related data/time library, timezone compiler, and Angular components. Please let me know what you think, and if you have any suggestions for changes or additions to the website.

3 2

tz-announce GPG key renewed
by Paul Eggert Sept. 2, 2021

Sept. 2, 2021

The GPG key I use in tz-announce notices expired on August 31. I renewed it for another five years, and the renewed version is appended to this email. Copies of the key are also available for download from my UCLA home directory <https://www.cs.ucla.edu/~eggert/public-key.gpg> and from my Savannah.gnu.org web page <https://savannah.gnu.org/users/eggert>. -----BEGIN PGP PUBLIC KEY BLOCK----- mQINBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqf hpxxdGA9Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9Xm AAtmXqeZVIYX/UFS96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Y gd7gx07Auwp7iw7eNvnoDTAlKAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kgh y+P6au6PrIIhYraeua7XDdb2LS1en3SsmE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6 x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZKQMr9amVPknjfPmJISqdhgB1D lEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2Sf1tk5eU8MBiyN/b Z03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujCOJVxq2kl jBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6C nrQzvJbBn6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQAB tCBQYXVsIEVnZ2VydCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PokCVQQTAQgAPwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4AWIQR+N5Kp2Kz31jO8FYjtl+kOYqp+NAUC YTAc/AUJHhWsGAAKCRDtl+kOYqp+NBKwD/9Qise9/wZsD8Nyl+ADOCIAFZY5qlSl /5SyCjJIRc6cx/Z0fm4yJVH2Tf3GlSBk1uW24z8+mB2ZxFQUGjio/2iDndSqxYR4 qvPGudo4RGvdvhw6LLqTdRsAY4947xLpNUO6gDtZsRpn4isn+ViX85XfGJrIFjBm zj70eMxEZZrz1IMfUB5I/2oNGDsXDZlCUU30RFMYChGA1ofpIHWdAs+lW2jVBfeE Lbi2su+oUpqrx83u0eJQg3RY3jmPjw8snHS4ieXpvS0e89qziBlNCqS59qJHaf4G XCjz+o5gap2e0NEeQYqcyCqAfqjI78KEpVJNQx5D/zSOvnNs6KuzWD7No4nb5A3p A6KA1JAwJW0H3F2+RhTEg+kFxpcCen0jjuFBnE3TfO3RSpSGqZN0j4AkuR6h/+I7 uUfaQAAope4mso/9VBEElaHYTQmA/m4/AXb2Kt/qkt6QgUIyJtSKcMCVTbfL6iIj rzu4EzkjtZJkbAfvU8lpkUsWX2Qwo25MwyxyzsHMUq9ccIRPEiI0hVu7jeFAql6c ql/3KUWvSr8QCyn7KWhfxyzy6j0+2xtQ29LHAOhboawJJoZd+PtintzHSSZ6G+8T Xn3EbjmHHlXWWfnvWyaJCuJzf1PybRgNYqL6EXCHRHCIb4S9Av8sJpJzZiskG1v5 WUkv79aHb1ol14kCHAQQAQIABgUCVi604AAKCRDNVPzj2WS++xxpD/4hZPbOUfcF LwePuSD3tqKrcmAq0vmyND1aNSOht0OlUbnHtsWxJmThEVEF25VfPbWhD+DZjRj8 hkQNzgkdeLJXJNj8JqS/MedrVa3j3wzHAnSt6fIQ8VvLmZDYg2gCpZrlU/y15Oby OrPkgOCC6MC2PFwHnEpAfR0d6AdbZ+ZeLqbvkB/tkMsqroNMSlPtgq8AWCKX++WJ TBpSw0o/iZjNkq7jW/BWgEVn51oTH8mgS2QN7mxltlaGG3x0AINjKcawfTX+lPks dZ5h9Fy+2QD9MoeAoEKsrS1zFYSVAVwrVAGwvAvz7sFxYzAh0Z+IO80Vwvm8VWfK rKr+483dzR7MzqfQyuCfMwEWg+hQ8r26qCRbe5KgNozVLsV3f1Sj5PwwnT5KE7jg ikYHGk+kSti1V/PiiKfCn9VAHvDad4P+o11R7aH4PaoZYb0M+S7FmKaQfeWcpymH LmpfG8JA7MCsQY0U7ix2jYHIjRZZgolYJ8T2JFf4VlzhiwsMwFNycPqNmGHF4da1 dm248ugKqLFls2aVdb9mTlFYrUQOtLN/FizELEv8dXt4A1bjoK9pO1ZFwffgfP5a fmFjHMSX6Z3KcXGmXZ1tYQocco7S4J4PyERGFhTyT7skXIzuml59+2G4WxGiatJI 3hhxaN0237vot5sIVDl1TpCMLr/02+qKfbkCDQRMgHJkARAApoXrvxP3DIfjCNOt XU/PdwMShKdX/RlSs5PfunV1wbKP8herXHrvQdFVqECaTSxmlhzbk8X0PkY9gcVa U2O49T3qsOd1cHeF52YFGEt0LhsBeMjgNX5uZ1V76r8gyeVlFpWWb0SIwJUBHrDX exF67upeRb2vdHBjYDNeySn+0B7gFEqvVmZu+LadudDp6kQLjatFvHQHUSGNshBn kkcaTbiI9Pst0GCc2aiznBiPPA2WQxAPlPRh3OGTsn5THADmbjqY6FEMLasVX8DS CblMvLwNeO/8SxziBidhqLpJCqdQRWHku5XxgIkGeKOz5OLDvXHWJyafrEYjjkS6 Ak6B5z6svKliClWnjHQcjlPzyoFFgKTEfcqDxCj4RY0D0DgtFD0NfyeOidrSB/Sz Te2hwryQE3rpSiqo+0cGdzh4yAHKYJ+UrXZ4p93ZhjGfKD1xlrNYDlWyW9PGmbvq FuDmiIAQf9WD/wzEfICc+F+uDDI+uYkRxUFp92ykmdhDEFg1yjYsU8iGU69aHyvh q36z4zctvbqhRNzOWB1bVJ/dIMDvsExGcXQVDIT7sDNXv0wE3jKSKpp7NDG1oXUX L+2+SF99Kjy753AbQSAmH617fyBNwhJWvQYg+mUvPpiGOtses9EXUI3lS4v0MEaP G43flEs1UR+1rpFQWVHo1y1OO+sAEQEAAYkCPAQYAQgAJgIbDBYhBH43kqnYrPfW M7wViO2X6Q5iqn40BQJhMB1RBQkeFaxtAAoJEO2X6Q5iqn40d5QP/iRm1LyrCKbM dqgP9ShOcPH7UfFEr4SY2TDdQgE4L+QItP16RNgTxAkxaBxK95I0nletr03inRKw sb0dIw/BH2LXbG2DjI6yKJK6UThVhWWBXYuGjSv2i6bVIzHLRY3IOQF+8dyVJ+vo eaOtxdV1lYR1ke/Dv6pFqUGGNBsSVu/2R03uCffTA9OsRzbuV5mJrFgxVFmBAguL N/cT5Ffh77x3LsA61Ro3hIX4399GFFBQ3h4RfMA1nNWiU0KjNy/GtW0amxn26zhq Qvy0W0hEJRA6ts+e/4ZHwcX3U7NTnPTckbCyy71d7U8/AVHkoy7EB8ROcDbJHTJc KlG9f6eYlPZ2aYVqBd9n1Yj4NYT1zobrQjvHQRCUAx0naKscN2es9x/rWvg4BnnB cXRaT2a8Wy3pKzLGD61dstvUM7tnyvdBxHk7aLlbdsfZP+flP2tbHkFNZWH5myPE lPMcQGFYyi9to+4YZU28G3rnzxmKFWkYAEMaxPZPunOZnOBHURFhgk/qs6GYSTPv g0u/kd1JV2yOKHb8+SB/Dpk/gx9KybTUC3TtbW1b2X94ErB8LCmpMi26a3ZvyxrE 5DJx2GdUoj2QkKTSFQV7MOo1tJ9vwtSfHnpT/+E6yKtzCLl9CNiVjd57puN1BhWC VvLwfAzUC2UvpPYh8u3maJaMAC6BgK78 =JpE/ -----END PGP PUBLIC KEY BLOCK-----

1 0

tzcode: uninitialized sp->charcnt gives clang analyzer warning
by Jan Engelhardt Aug. 11, 2021

Aug. 11, 2021

When building tzcode commit 7f74206b39673b1a110285c6992f70507e211060 with -DALL_STATE, clang reports a loop with a undefined termination condition because sp->charcnt is not set before its use. There should probably be a sp->charcnt=0 in zoneinit. >> clang --analyze -Xanalyzer -analyzer-output=text localtime.c -DALL_STATE localtime.c:321:16: warning: The right operand of '<' is a garbage value [core.UndefinedBinaryOperatorResult] for (i = 0; i < sp->charcnt; ++i) ^ localtime.c:2210:7: note: 'err' is 0 if (err) { ^~~ localtime.c:2210:3: note: Taking false branch if (err) { ^ localtime.c:2214:3: note: Calling 'tzset_unlocked' tzset_unlocked(); ^~~~~~~~~~~~~~~~ localtime.c:1383:13: note: Assuming 'name' is null int lcl = name ? strlen(name) < sizeof lcl_TZname : -1; ^~~~ localtime.c:1383:13: note: '?' condition is false localtime.c:1384:7: note: 'lcl' is < 0 if (lcl < 0 ^~~ localtime.c:1384:7: note: '?' condition is true localtime.c:1385:9: note: Assuming 'lcl_is_set' is >= 0 ? lcl_is_set < 0 ^~~~~~~~~~~~~~ localtime.c:1384:3: note: Taking false branch if (lcl < 0 ^ localtime.c:1389:7: note: Assuming 'sp' is null if (! sp) ^~~~ localtime.c:1389:3: note: Taking true branch if (! sp) ^ localtime.c:1390:19: note: Uninitialized value stored to field 'charcnt' lclptr = sp = malloc(sizeof *lclptr); ^~~~~~~~~~~~~~~~~~~~~~ localtime.c:1392:7: note: Assuming 'sp' is non-null if (sp) { ^~ localtime.c:1392:3: note: Taking true branch if (sp) { ^ localtime.c:1393:9: note: Calling 'zoneinit' if (zoneinit(sp, name) != 0) ^~~~~~~~~~~~~~~~~~ localtime.c:1355:7: note: 'name' is null if (name && ! name[0]) { ^~~~ localtime.c:1355:12: note: Left side of '&&' is false if (name && ! name[0]) { ^ localtime.c:1369:15: note: Calling 'tzload' int err = tzload(name, sp, true); ^~~~~~~~~~~~~~~~~~~~~~ localtime.c:739:7: note: Assuming 'lsp' is null if (!lsp) ^~~~ localtime.c:739:3: note: Taking true branch if (!lsp) ^ localtime.c:740:5: note: Returning without writing to 'sp->charcnt' return errno; ^ localtime.c:1369:15: note: Returning from 'tzload' int err = tzload(name, sp, true); ^~~~~~~~~~~~~~~~~~~~~~ localtime.c:1370:9: note: Assuming 'err' is equal to 0 if (err != 0 && name && name[0] != ':' && tzparse(name, sp, NULL)) ^~~~~~~~ localtime.c:1370:18: note: Left side of '&&' is false if (err != 0 && name && name[0] != ':' && tzparse(name, sp, NULL)) ^ localtime.c:1372:9: note: 'err' is equal to 0 if (err == 0) ^~~ localtime.c:1372:5: note: Taking true branch if (err == 0) ^ localtime.c:1373:7: note: Calling 'scrub_abbrs' scrub_abbrs(sp); ^~~~~~~~~~~~~~~ localtime.c:321:16: note: The right operand of '<' is a garbage value for (i = 0; i < sp->charcnt; ++i) ^ ~~~~~~~~~~~ localtime.c:1277:4: warning: Value stored to 'theiroffset' is never read [deadcode.DeadStores] theiroffset = theirstdoffset; ^ ~~~~~~~~~~~~~~ localtime.c:1277:4: note: Value stored to 'theiroffset' is never read theiroffset = theirstdoffset; ^ ~~~~~~~~~~~~~~ 2 warnings generated.

5 11

No leap second on 2021-12-31
by Tim Parenti July 22, 2021

July 22, 2021

Per IERS, Bulletin C 62 (2021-07-05) https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.62 …and forwarded below. A patch updating leap-seconds.list from NIST is attached, and is installed in the development repository. -- Tim Parenti ---------- Forwarded message --------- From: IERS EOP Product Center <iers.eoppc(a)obspm.fr> Date: Mon, 5 Jul 2021 at 05:54 Subject: Bulletin C number 62 To: <bulc.iers(a)obspm.fr> INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE DE L'IERS OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : +33 1 40 51 23 35 e-mail : services.iers(a)obspm.fr http://hpiers.obspm.fr/eop-pc Paris, 05 July 2021 Bulletin C 62 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO leap second will be introduced at the end of December 2021. The difference between Coordinated Universal Time UTC and the International Atomic Time TAI is : from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Christian BIZOUARD Director Earth Orientation Center of IERS Observatoire de Paris, France

1 0

Need input - minimal tzdata install
by Patsy Griffin July 21, 2021

July 21, 2021

Hi, We are trying to reduce the required base installation on containers. We are looking at ways to reduce the amount of timezone data needed. Specifically, we are considering providing a minimal/UTC-only tzdata package. Is this something that the tz project would consider providing? Would the tz project be willing to document a recommended minimum set of files for such an installation? Thanks, Patsy

3 3

[PROPOSED] Do not include sys/wait.h
by Paul Eggert July 15, 2021

July 15, 2021

This cleans up some code no longer needed now that we’ve dropped support for zic -y. Issue noted by spazmodius in: https://github.com/eggert/tz/commit/284e877d7511d964249ecfd2e75a9cab85e2741… * Makefile, NEWS: Update commentary. * private.h (HAVE_SYS_WAIT_H): Remove. All uses removed. * zic.c: Do not include sys/wait.h. (WIFEXITED, WEXITSTATUS): Remove; unused. --- Makefile | 1 - NEWS | 3 +++ private.h | 4 ---- zic.c | 11 ----------- 4 files changed, 3 insertions(+), 16 deletions(-) diff --git a/Makefile b/Makefile index 77ef331..f441fce 100644 --- a/Makefile +++ b/Makefile @@ -222,7 +222,6 @@ LDLIBS= # -DHAVE_STRTOLL=0 if your system lacks the strtoll function # -DHAVE_SYMLINK=0 if your system lacks the symlink function # -DHAVE_SYS_STAT_H=0 if your compiler lacks a <sys/stat.h> -# -DHAVE_SYS_WAIT_H=0 if your compiler lacks a <sys/wait.h> # -DHAVE_TZSET=0 if your system lacks a tzset function # -DHAVE_UNISTD_H=0 if your compiler lacks a <unistd.h> # -Dlocale_t=XXX if your system uses XXX instead of locale_t diff --git a/NEWS b/NEWS index 53890a7..f53e431 100644 --- a/NEWS +++ b/NEWS @@ -124,6 +124,9 @@ Unreleased, experimental changes "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for noting the possibility of POSIX conformance.) + zic.c no longer requires sys/wait.h (thanks to spazmodius for + noting it wasn't needed). + When reading slim TZif files, zdump no longer mishandles leap seconds on the rare platforms where time_t counts leap seconds, fixing a bug introduced in 2014g. diff --git a/private.h b/private.h index 340a354..6425298 100644 --- a/private.h +++ b/private.h @@ -90,10 +90,6 @@ #define HAVE_SYS_STAT_H 1 #endif /* !defined HAVE_SYS_STAT_H */ -#ifndef HAVE_SYS_WAIT_H -#define HAVE_SYS_WAIT_H 1 -#endif /* !defined HAVE_SYS_WAIT_H */ - #ifndef HAVE_UNISTD_H #define HAVE_UNISTD_H 1 #endif /* !defined HAVE_UNISTD_H */ diff --git a/zic.c b/zic.c index 77a5698..8d1ea03 100644 --- a/zic.c +++ b/zic.c @@ -48,17 +48,6 @@ typedef int_fast64_t zic_t; #define MKDIR_UMASK 0755 #endif -#if HAVE_SYS_WAIT_H -#include <sys/wait.h> /* for WIFEXITED and WEXITSTATUS */ -#endif /* HAVE_SYS_WAIT_H */ - -#ifndef WIFEXITED -#define WIFEXITED(status) (((status) & 0xff) == 0) -#endif /* !defined WIFEXITED */ -#ifndef WEXITSTATUS -#define WEXITSTATUS(status) (((status) >> 8) & 0xff) -#endif /* !defined WEXITSTATUS */ - /* The maximum ptrdiff_t value, for pre-C99 platforms. */ #ifndef PTRDIFF_MAX static ptrdiff_t const PTRDIFF_MAX = MAXVAL(ptrdiff_t, TYPE_BIT(ptrdiff_t)); -- 2.31.1

1 0

Fwd: FORMAT Missing in Africa/Windhoek & America/Belize
by vaibhav shrivastava June 28, 2021

June 28, 2021

Please check below mail ---------- Forwarded message --------- From: vaibhav shrivastava <vaibhav.sh17(a)gmail.com> Date: Fri, 25 Jun 2021, 09:07 Subject: Re: [tz] FORMAT Missing in Africa/Windhoek & America/Belize To: Arthur David Olson <arthurdavidolson(a)gmail.com> Daylight Saving Time (DST) Not Observed in Year 2021 Windhoek currently observes Central Africa Time (CAT) all year. DST is no longer in use. Clocks do not change in Windhoek, Namibia. The previous DST change in Windhoek was on 24 October 2017 Why WAT is mentioned? Why it is different from other rule and format? Regards, Vaibhav On Thu, 24 Jun 2021, 16:30 Arthur David Olson, <arthurdavidolson(a)gmail.com> wrote: > A bare "%s" in a zone line such as ... > Zone Africa/Windhoek 2:00 Namibia %s > ...means that the abbreviations are completely specified in the Rule lines > being used. In this case, the operative Rule lines are... > Rule Namibia 1994 only - Mar 21 0:00 -1:00 > WAT > Rule Namibia 1994 2017 - Sep Sun>=1 2:00 0 > CAT > Rule Namibia 1995 2017 - Apr Sun>=1 2:00 -1:00 > WAT > ...and so the abbreviations "WAT" and "CAT" are the result. > > @dashdashado > > On Thu, Jun 24, 2021 at 4:09 AM vaibhav shrivastava via tz <tz(a)iana.org> > wrote: > >> Please check FORMAT is marked as %s for these 2 timezone >> Africa/Windhoek & America/Belize >> >> >> Zone Africa/Windhoek 2:00 Namibia %s >> >> Same for >> >> America/Belize -6:00 Belize %s >> >> >> Regards, >> Vaibhav >> >>

3 8

FORMAT Missing in Africa/Windhoek & America/Belize
by vaibhav shrivastava June 24, 2021

June 24, 2021

Please check FORMAT is marked as %s for these 2 timezone Africa/Windhoek & America/Belize Zone Africa/Windhoek 2:00 Namibia %s Same for America/Belize -6:00 Belize %s Regards, Vaibhav

2 1

Tzdata - timedatectl issue
by Prasanth Ramesh June 23, 2021

June 23, 2021

Hi, I am facing an issue with the timedatectl command outputs which were wrong from 2020b version tzdata (Local time & Time zone) values were wrong are there any changes happened relevant to this? *From- tzdata-2020b version - Broken* #timedatectl * Local time: Fri 2019-11-29 16:42:57 * Universal time: Fri 2019-11-29 16:42:57 UTC RTC time: n/a * Time zone: Asia/Kolkata (, +0000)* System clock synchronized: no NTP service: inactive RTC in local TZ: no *Before tzdata-2020a - Good*#timedatectl * Local time: Fri 2019-11-29 22:03:40 IST* Universal time: Fri 2019-11-29 16:33:40 UTC RTC time: n/a * Time zone: Asia/Kolkata (IST, +0530)* System clock synchronized: no NTP service: inactive RTC in local TZ: no Thanks & Regards, Prasanth

1 1

Destruction of timezone history - please revert (typos corrected)
by Alois Treindl June 15, 2021

June 15, 2021

I consider the decision to merge zones of multiple countries, just because they share a common post-1970 history, one of the worst decisions ever made for the TZ project. There used to be Zone Europe/Copenhagen, which represented the exact timezone history of Copenhagen, in fact of all of Denmark, since the introduction of standard time in Denmark in 1890. Now the file 'europe' says # For Denmark see Europe/Berlin. But zone Europe/Berlin is a bad representation of Denmark's timezone history. It gives false data from 1949 backward. The decision to remove zones like Europe/Copenhagen from the main zone files destroys the work of a whole generation of timezone history researchers. It is a completely unnecessary step, forced by nothing. I urge the responsible persons to revert this step.

3 7

Question about invalid timezone file: no timezone found in OlsonData
by Joe Culler June 14, 2021

June 14, 2021

Hello, I have a program running on Yocto. When it runs, I get an error: /usr/share/zoneinfo/Israel: invalid timezone file: no timezone found in OlsonData If I copy zoneinfo's directory from Linux distros (Debian, Ubutnu, ArchLinux), the program runs without an error. I downloaded tzdb-2021a.tar.lz and installed it, encountered the same error. Did I miss something? Thanks. - Joe

3 3

[PROPOSED] Avoid backward links in zone.tab
by Paul Eggert June 12, 2021

June 12, 2021

Recent changes caused zone.tab to refer to links defined in the 'backward' file, which means it no longer works in the now-rare case where 'backward' is not used. Fix this by changing zone.tab to refer to the primary name of each zone. * checktab.awk: Adjust to check the new setup. * zone.tab: Replace backward links in the 3rd column with the primary zone names. This lets us fix a longstanding problem with Vietnam, as zone.tab can now have a separate entry for north Vietnam's different time zone history in the 1970s (this was already true of zone1970.tab). --- checktab.awk | 48 +++++++-------- zone.tab | 161 ++++++++++++++++++++++++++------------------------- 2 files changed, 105 insertions(+), 104 deletions(-) diff --git a/checktab.awk b/checktab.awk index 54ac0a6..d5317ac 100644 --- a/checktab.awk +++ b/checktab.awk @@ -58,11 +58,12 @@ BEGIN { zone_table, zone_NR >>"/dev/stderr" status = 1 } - split($1, cca, /,/) - cc = cca[1] + ccs = input_ccs[zone_NR] = $1 coordinates = $2 tz = $3 - comments = $4 + comments = input_comments[zone_NR] = $4 + split(ccs, cca, /,/) + cc = cca[1] # Don't complain about a special case for Crimea in zone.tab. # FIXME: zone.tab should be removed, since it is obsolete. @@ -77,12 +78,9 @@ BEGIN { cc0 = cc tz0 = tz tztab[tz] = 1 - tz2comments[tz] = comments tz2NR[tz] = zone_NR for (i in cca) { cc = cca[i] - cctz = cc tz - cctztab[cctz] = 1 if (cc2name[cc]) { cc_used[cc]++ } else { @@ -99,27 +97,27 @@ BEGIN { } } - for (cctz in cctztab) { - cc = substr (cctz, 1, 2) - tz = substr (cctz, 3) - if (1 < cc_used[cc]) { - comments_needed[tz] = cc - } - } - for (cctz in cctztab) { - cc = substr (cctz, 1, 2) - tz = substr (cctz, 3) - if (!comments_needed[tz] && tz2comments[tz]) { + for (i = 1; i <= zone_NR; i++) { + ccs = input_ccs[i] + if (!ccs) continue + comments = input_comments[i] + split(ccs, cca, /,/) + used_max = 0 + for (j in cca) { + cc = cca[j] + if (used_max < cc_used[cc]) { + used_max = cc_used[cc] + } + } + if (used_max <= 1 && comments) { printf "%s:%d: unnecessary comment '%s'\n", \ - zone_table, tz2NR[tz], tz2comments[tz] \ - >>"/dev/stderr" - tz2comments[tz] = 0 + zone_table, i, comments \ + >>"/dev/stderr" status = 1 - } else if (comments_needed[tz] && !tz2comments[tz]) { + } else if (1 < cc_used[cc] && !comments) { printf "%s:%d: missing comment for %s\n", \ - zone_table, tz2NR[tz], comments_needed[tz] \ + zone_table, i, cc \ >>"/dev/stderr" - tz2comments[tz] = 1 status = 1 } } @@ -172,14 +170,12 @@ END { status = 1 } } - if (zone_table != "zone.tab") { - for (tz in tztab) { + for (tz in tztab) { if (!zoneSeen[tz]) { printf "%s:%d: no Zone table for '%s'\n", \ zone_table, tz2NR[tz], tz >>"/dev/stderr" status = 1 } - } } if (0 < want_warnings) { for (cc in cc2name) { diff --git a/zone.tab b/zone.tab index 14fceb9..fe53f0a 100644 --- a/zone.tab +++ b/zone.tab @@ -16,6 +16,10 @@ # clocks have agreed since 1970; this is a narrower definition than # that of zone1970.tab. # +# Unlike zone1970.tab, this file's third column can contain duplicates, +# and a row's third column does not necessarily name a location within +# the country identified by the row's first column. +# # This table is intended as an aid for users, to help them select timezones # appropriate for their practical needs. It is not intended to take or # endorse any position on legal or territorial claims. @@ -25,12 +29,12 @@ AD +4230+00131 Europe/Andorra AE +2518+05518 Asia/Dubai AF +3431+06912 Asia/Kabul -AG +1703-06148 America/Antigua -AI +1812-06304 America/Anguilla +AG +1703-06148 America/Port_of_Spain +AI +1812-06304 America/Port_of_Spain AL +4120+01950 Europe/Tirane AM +4011+04430 Asia/Yerevan -AO -0848+01314 Africa/Luanda -AQ -7750+16636 Antarctica/McMurdo New Zealand time - McMurdo, South Pole +AO -0848+01314 Africa/Lagos +AQ -7750+16636 Pacific/Auckland New Zealand time - McMurdo, South Pole AQ -6617+11031 Antarctica/Casey Casey AQ -6835+07758 Antarctica/Davis Davis AQ -6640+14001 Antarctica/DumontDUrville Dumont-d'Urville @@ -66,23 +70,23 @@ AU -3455+13835 Australia/Adelaide South Australia AU -1228+13050 Australia/Darwin Northern Territory AU -3157+11551 Australia/Perth Western Australia (most areas) AU -3143+12852 Australia/Eucla Western Australia (Eucla) -AW +1230-06958 America/Aruba -AX +6006+01957 Europe/Mariehamn +AW +1230-06958 America/Curacao +AX +6006+01957 Europe/Helsinki AZ +4023+04951 Asia/Baku -BA +4352+01825 Europe/Sarajevo +BA +4352+01825 Europe/Belgrade BB +1306-05937 America/Barbados BD +2343+09025 Asia/Dhaka BE +5050+00420 Europe/Brussels -BF +1222-00131 Africa/Ouagadougou +BF +1222-00131 Africa/Abidjan BG +4241+02319 Europe/Sofia -BH +2623+05035 Asia/Bahrain -BI -0323+02922 Africa/Bujumbura -BJ +0629+00237 Africa/Porto-Novo -BL +1753-06251 America/St_Barthelemy +BH +2623+05035 Asia/Qatar +BI -0323+02922 Africa/Maputo +BJ +0629+00237 Africa/Lagos +BL +1753-06251 America/Port_of_Spain BM +3217-06446 Atlantic/Bermuda BN +0456+11455 Asia/Brunei BO -1630-06809 America/La_Paz -BQ +120903-0681636 America/Kralendijk +BQ +120903-0681636 America/Curacao BR -0351-03225 America/Noronha Atlantic islands BR -0127-04829 America/Belem Para (east); Amapa BR -0343-03830 America/Fortaleza Brazil (northeast: MA, PI, CE, RN, PB) @@ -101,7 +105,7 @@ BR -0640-06952 America/Eirunepe Amazonas (west) BR -0958-06748 America/Rio_Branco Acre BS +2505-07721 America/Nassau BT +2728+08939 Asia/Thimphu -BW -2439+02555 Africa/Gaborone +BW -2439+02555 Africa/Maputo BY +5354+02734 Europe/Minsk BZ +1730-08812 America/Belize CA +4734-05243 America/St_Johns Newfoundland; Labrador (southeast) @@ -133,17 +137,17 @@ CA +6043-13503 America/Whitehorse MST - Yukon (east) CA +6404-13925 America/Dawson MST - Yukon (west) CA +4916-12307 America/Vancouver Pacific - BC (most areas) CC -1210+09655 Indian/Cocos -CD -0418+01518 Africa/Kinshasa Dem. Rep. of Congo (west) -CD -1140+02728 Africa/Lubumbashi Dem. Rep. of Congo (east) -CF +0422+01835 Africa/Bangui -CG -0416+01517 Africa/Brazzaville +CD -0418+01518 Africa/Lagos Dem. Rep. of Congo (west) +CD -1140+02728 Africa/Maputo Dem. Rep. of Congo (east) +CF +0422+01835 Africa/Lagos +CG -0416+01517 Africa/Lagos CH +4723+00832 Europe/Zurich CI +0519-00402 Africa/Abidjan CK -2114-15946 Pacific/Rarotonga CL -3327-07040 America/Santiago Chile (most areas) CL -5309-07055 America/Punta_Arenas Region of Magallanes CL -2709-10926 Pacific/Easter Easter Island -CM +0403+00942 Africa/Douala +CM +0403+00942 Africa/Lagos CN +3114+12128 Asia/Shanghai Beijing Time CN +4348+08735 Asia/Urumqi Xinjiang Time CO +0436-07405 America/Bogota @@ -156,10 +160,10 @@ CY +3510+03322 Asia/Nicosia Cyprus (most areas) CY +3507+03357 Asia/Famagusta Northern Cyprus CZ +5005+01426 Europe/Prague DE +5230+01322 Europe/Berlin Germany (most areas) -DE +4742+00841 Europe/Busingen Busingen -DJ +1136+04309 Africa/Djibouti +DE +4742+00841 Europe/Zurich Swiss time +DJ +1136+04309 Africa/Nairobi DK +5540+01235 Europe/Copenhagen -DM +1518-06124 America/Dominica +DM +1518-06124 America/Port_of_Spain DO +1828-06954 America/Santo_Domingo DZ +3647+00303 Africa/Algiers EC -0210-07950 America/Guayaquil Ecuador (mainland) @@ -167,11 +171,11 @@ EC -0054-08936 Pacific/Galapagos Galapagos Islands EE +5925+02445 Europe/Tallinn EG +3003+03115 Africa/Cairo EH +2709-01312 Africa/El_Aaiun -ER +1520+03853 Africa/Asmara +ER +1520+03853 Africa/Nairobi ES +4024-00341 Europe/Madrid Spain (mainland) ES +3553-00519 Africa/Ceuta Ceuta, Melilla ES +2806-01524 Atlantic/Canary Canary Islands -ET +0902+03842 Africa/Addis_Ababa +ET +0902+03842 Africa/Nairobi FI +6010+02458 Europe/Helsinki FJ -1808+17825 Pacific/Fiji FK -5142-05751 Atlantic/Stanley @@ -180,22 +184,22 @@ FM +0658+15813 Pacific/Pohnpei Pohnpei/Ponape FM +0519+16259 Pacific/Kosrae Kosrae FO +6201-00646 Atlantic/Faroe FR +4852+00220 Europe/Paris -GA +0023+00927 Africa/Libreville +GA +0023+00927 Africa/Lagos GB +513030-0000731 Europe/London -GD +1203-06145 America/Grenada +GD +1203-06145 America/Port_of_Spain GE +4143+04449 Asia/Tbilisi GF +0456-05220 America/Cayenne -GG +492717-0023210 Europe/Guernsey +GG +492717-0023210 Europe/London GH +0533-00013 Africa/Accra GI +3608-00521 Europe/Gibraltar GL +6411-05144 America/Nuuk Greenland (most areas) GL +7646-01840 America/Danmarkshavn National Park (east coast) GL +7029-02158 America/Scoresbysund Scoresbysund/Ittoqqortoormiit GL +7634-06847 America/Thule Thule/Pituffik -GM +1328-01639 Africa/Banjul -GN +0931-01343 Africa/Conakry -GP +1614-06132 America/Guadeloupe -GQ +0345+00847 Africa/Malabo +GM +1328-01639 Africa/Abidjan +GN +0931-01343 Africa/Abidjan +GP +1614-06132 America/Port_of_Spain +GQ +0345+00847 Africa/Lagos GR +3758+02343 Europe/Athens GS -5416-03632 Atlantic/South_Georgia GT +1438-09031 America/Guatemala @@ -204,7 +208,7 @@ GW +1151-01535 Africa/Bissau GY +0648-05810 America/Guyana HK +2217+11409 Asia/Hong_Kong HN +1406-08713 America/Tegucigalpa -HR +4548+01558 Europe/Zagreb +HR +4548+01558 Europe/Belgrade HT +1832-07220 America/Port-au-Prince HU +4730+01905 Europe/Budapest ID -0610+10648 Asia/Jakarta Java, Sumatra @@ -213,29 +217,29 @@ ID -0507+11924 Asia/Makassar Borneo (east, south); Sulawesi/Celebes, Bali, Nusa ID -0232+14042 Asia/Jayapura New Guinea (West Papua / Irian Jaya); Malukus/Moluccas IE +5320-00615 Europe/Dublin IL +314650+0351326 Asia/Jerusalem -IM +5409-00428 Europe/Isle_of_Man +IM +5409-00428 Europe/London IN +2232+08822 Asia/Kolkata IO -0720+07225 Indian/Chagos IQ +3321+04425 Asia/Baghdad IR +3540+05126 Asia/Tehran IS +6409-02151 Atlantic/Reykjavik IT +4154+01229 Europe/Rome -JE +491101-0020624 Europe/Jersey +JE +491101-0020624 Europe/London JM +175805-0764736 America/Jamaica JO +3157+03556 Asia/Amman JP +353916+1394441 Asia/Tokyo KE -0117+03649 Africa/Nairobi KG +4254+07436 Asia/Bishkek -KH +1133+10455 Asia/Phnom_Penh +KH +1133+10455 Asia/Bangkok KI +0125+17300 Pacific/Tarawa Gilbert Islands KI -0308-17105 Pacific/Enderbury Phoenix Islands KI +0152-15720 Pacific/Kiritimati Line Islands -KM -1141+04316 Indian/Comoro -KN +1718-06243 America/St_Kitts +KM -1141+04316 Africa/Nairobi +KN +1718-06243 America/Port_of_Spain KP +3901+12545 Asia/Pyongyang KR +3733+12658 Asia/Seoul -KW +2920+04759 Asia/Kuwait -KY +1918-08123 America/Cayman +KW +2920+04759 Asia/Riyadh +KY +1918-08123 America/Panama KZ +4315+07657 Asia/Almaty Kazakhstan (most areas) KZ +4448+06528 Asia/Qyzylorda Qyzylorda/Kyzylorda/Kzyl-Orda KZ +5312+06337 Asia/Qostanay Qostanay/Kostanay/Kustanay @@ -243,13 +247,13 @@ KZ +5017+05710 Asia/Aqtobe Aqtobe/Aktobe KZ +4431+05016 Asia/Aqtau Mangghystau/Mankistau KZ +4707+05156 Asia/Atyrau Atyrau/Atirau/Gur'yev KZ +5113+05121 Asia/Oral West Kazakhstan -LA +1758+10236 Asia/Vientiane +LA +1758+10236 Asia/Bangkok LB +3353+03530 Asia/Beirut -LC +1401-06100 America/St_Lucia -LI +4709+00931 Europe/Vaduz +LC +1401-06100 America/Port_of_Spain +LI +4709+00931 Europe/Zurich LK +0656+07951 Asia/Colombo LR +0618-01047 Africa/Monrovia -LS -2928+02730 Africa/Maseru +LS -2928+02730 Africa/Johannesburg LT +5441+02519 Europe/Vilnius LU +4936+00609 Europe/Luxembourg LV +5657+02406 Europe/Riga @@ -257,26 +261,26 @@ LY +3254+01311 Africa/Tripoli MA +3339-00735 Africa/Casablanca MC +4342+00723 Europe/Monaco MD +4700+02850 Europe/Chisinau -ME +4226+01916 Europe/Podgorica -MF +1804-06305 America/Marigot -MG -1855+04731 Indian/Antananarivo +ME +4226+01916 Europe/Belgrade +MF +1804-06305 America/Port_of_Spain +MG -1855+04731 Africa/Nairobi MH +0709+17112 Pacific/Majuro Marshall Islands (most areas) MH +0905+16720 Pacific/Kwajalein Kwajalein -MK +4159+02126 Europe/Skopje -ML +1239-00800 Africa/Bamako +MK +4159+02126 Europe/Belgrade +ML +1239-00800 Africa/Abidjan MM +1647+09610 Asia/Yangon MN +4755+10653 Asia/Ulaanbaatar Mongolia (most areas) MN +4801+09139 Asia/Hovd Bayan-Olgiy, Govi-Altai, Hovd, Uvs, Zavkhan MN +4804+11430 Asia/Choibalsan Dornod, Sukhbaatar MO +221150+1133230 Asia/Macau -MP +1512+14545 Pacific/Saipan +MP +1512+14545 Pacific/Guam MQ +1436-06105 America/Martinique -MR +1806-01557 Africa/Nouakchott -MS +1643-06213 America/Montserrat +MR +1806-01557 Africa/Abidjan +MS +1643-06213 America/Port_of_Spain MT +3554+01431 Europe/Malta MU -2010+05730 Indian/Mauritius MV +0410+07330 Indian/Maldives -MW -1547+03500 Africa/Blantyre +MW -1547+03500 Africa/Maputo MX +1924-09909 America/Mexico_City Central Time MX +2105-08646 America/Cancun Eastern Standard Time - Quintana Roo MX +2058-08937 America/Merida Central Time - Campeche, Yucatan @@ -293,7 +297,7 @@ MY +0133+11020 Asia/Kuching Sabah, Sarawak MZ -2558+03235 Africa/Maputo NA -2234+01706 Africa/Windhoek NC -2216+16627 Pacific/Noumea -NE +1331+00207 Africa/Niamey +NE +1331+00207 Africa/Lagos NF -2903+16758 Pacific/Norfolk NG +0627+00324 Africa/Lagos NI +1209-08617 America/Managua @@ -304,7 +308,7 @@ NR -0031+16655 Pacific/Nauru NU -1901-16955 Pacific/Niue NZ -3652+17446 Pacific/Auckland New Zealand (most areas) NZ -4357-17633 Pacific/Chatham Chatham Islands -OM +2336+05835 Asia/Muscat +OM +2336+05835 Asia/Dubai PA +0858-07932 America/Panama PE -1203-07703 America/Lima PF -1732-14934 Pacific/Tahiti Society Islands @@ -359,32 +363,32 @@ RU +4658+14242 Asia/Sakhalin MSK+08 - Sakhalin Island RU +6728+15343 Asia/Srednekolymsk MSK+08 - Sakha (E); North Kuril Is RU +5301+15839 Asia/Kamchatka MSK+09 - Kamchatka RU +6445+17729 Asia/Anadyr MSK+09 - Bering Sea -RW -0157+03004 Africa/Kigali +RW -0157+03004 Africa/Maputo SA +2438+04643 Asia/Riyadh SB -0932+16012 Pacific/Guadalcanal SC -0440+05528 Indian/Mahe SD +1536+03232 Africa/Khartoum SE +5920+01803 Europe/Stockholm SG +0117+10351 Asia/Singapore -SH -1555-00542 Atlantic/St_Helena -SI +4603+01431 Europe/Ljubljana -SJ +7800+01600 Arctic/Longyearbyen -SK +4809+01707 Europe/Bratislava -SL +0830-01315 Africa/Freetown -SM +4355+01228 Europe/San_Marino -SN +1440-01726 Africa/Dakar -SO +0204+04522 Africa/Mogadishu +SH -1555-00542 Africa/Abidjan +SI +4603+01431 Europe/Belgrade +SJ +7800+01600 Europe/Oslo +SK +4809+01707 Europe/Prague +SL +0830-01315 Africa/Abidjan +SM +4355+01228 Europe/Rome +SN +1440-01726 Africa/Abidjan +SO +0204+04522 Africa/Nairobi SR +0550-05510 America/Paramaribo SS +0451+03137 Africa/Juba ST +0020+00644 Africa/Sao_Tome SV +1342-08912 America/El_Salvador -SX +180305-0630250 America/Lower_Princes +SX +180305-0630250 America/Curacao SY +3330+03618 Asia/Damascus -SZ -2618+03106 Africa/Mbabane +SZ -2618+03106 Africa/Johannesburg TC +2128-07108 America/Grand_Turk TD +1207+01503 Africa/Ndjamena TF -492110+0701303 Indian/Kerguelen -TG +0608+00113 Africa/Lome +TG +0608+00113 Africa/Abidjan TH +1345+10031 Asia/Bangkok TJ +3835+06848 Asia/Dushanbe TK -0922-17114 Pacific/Fakaofo @@ -396,12 +400,12 @@ TR +4101+02858 Europe/Istanbul TT +1039-06131 America/Port_of_Spain TV -0831+17913 Pacific/Funafuti TW +2503+12130 Asia/Taipei -TZ -0648+03917 Africa/Dar_es_Salaam +TZ -0648+03917 Africa/Nairobi UA +5026+03031 Europe/Kiev Ukraine (most areas) UA +4837+02218 Europe/Uzhgorod Transcarpathia UA +4750+03510 Europe/Zaporozhye Zaporozhye and east Lugansk -UG +0019+03225 Africa/Kampala -UM +2813-17722 Pacific/Midway Midway Islands +UG +0019+03225 Africa/Nairobi +UM +2813-17722 Pacific/Pago_Pago Midway Islands UM +1917+16637 Pacific/Wake Wake Island US +404251-0740023 America/New_York Eastern (most areas) US +421953-0830245 America/Detroit Eastern - MI (most areas) @@ -435,17 +439,18 @@ US +211825-1575130 Pacific/Honolulu Hawaii UY -345433-0561245 America/Montevideo UZ +3940+06648 Asia/Samarkand Uzbekistan (west) UZ +4120+06918 Asia/Tashkent Uzbekistan (east) -VA +415408+0122711 Europe/Vatican -VC +1309-06114 America/St_Vincent +VA +415408+0122711 Europe/Rome +VC +1309-06114 America/Port_of_Spain VE +1030-06656 America/Caracas -VG +1827-06437 America/Tortola -VI +1821-06456 America/St_Thomas -VN +1045+10640 Asia/Ho_Chi_Minh +VG +1827-06437 America/Port_of_Spain +VI +1821-06456 America/Port_of_Spain +VN +1045+10640 Asia/Bangkok Vietnam (north) +VN +1045+10640 Asia/Ho_Chi_Minh Vietnam (south) VU -1740+16825 Pacific/Efate WF -1318-17610 Pacific/Wallis WS -1350-17144 Pacific/Apia -YE +1245+04512 Asia/Aden -YT -1247+04514 Indian/Mayotte +YE +1245+04512 Asia/Riyadh +YT -1247+04514 Africa/Nairobi ZA -2615+02800 Africa/Johannesburg -ZM -1525+02817 Africa/Lusaka -ZW -1750+03103 Africa/Harare +ZM -1525+02817 Africa/Maputo +ZW -1750+03103 Africa/Maputo -- 2.27.0

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Regarding TimezoneDb page on Wiki
by Sachin Mahajan June 12, 2021

June 12, 2021

Dear Folks at IANA, Todays Greetings!!, I really appreciate your efforts to design & maintain TimezoneDb While searching on the net, I couldn't find any list where there is a mapping between 2 different set of timezone record schemes. For example "Europe/Vienna" maps to "(CET) Central European Time" So, I prepared a list for the same.(see the screenshot attached), along with relevant record like timeOffsets, countryCode, hasDST, etc., & want to share it with you IF it is of any value for the cause.I used wiki references & some PHP code for the same. If you think that my list is of any value, I will be glad to share the Excel worksheet it with you.. Thanks & Regards, Sachin M PS: Is there any reason why you haven't differentiated between North America & South America in the tz database?

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