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timezone improvements
by Robert E. Brown Aug. 26, 1999

Aug. 26, 1999

I work for a company that requires some capabilities beyond the standard time zone library. Here's the sort of thing we're interested in: Ability to efficiently do time calculations in several time zones at the same time in separate threads. Time zone functions might take a zone as argument instead of the current method of setting the TZ environment variable and calling tzset to change zones, which involves file I/O. Is there any prior art along these lines? I do see the routines whose names end with "_r". They seem to fix one glitch, but do not completely solve the problem. How can I get the capabilities I want integrated with the standard time zone library? By making it a part of the standard library, the chance increases that the code will be used, maintained, and completely debugged. We are willing to pay for the capabilities we want. Would Cygnus be a good source for this work? Do you have any other suggestions? Thanks very much. bob

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Historical zone changes
by Lblumbbs＠aol.com Aug. 19, 1999

Aug. 19, 1999

In December 1941 I understand the time in Hawaii when it is on the hour in the Eastern Standard time zone was 30 minutes past the hour. Today ther minutes are the same. Can you tell me what the time zone difference between the Eastern Standard time zone and the time zone covering Hawaii was in 1941? Can you tell when (year and month) any changes to this time difference changed.

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Re: tzcode1999e.tar.gz and tzdata1999e.tar.gz
by Ulrich Drepper Aug. 17, 1999

Aug. 17, 1999

Ado, > The files > ftp://elsie.nci.nih.gov/pub/tzcode1999e.tar.gz > and > ftp://elsie.nci.nih.gov/pub/tzdata1999e.tar.gz Unfortunately the files are not readable in the moment: -r-------- 1 8800 0 92586 Aug 17 19:28 tzcode1999e.tar.gz -r-------- 1 8800 0 104493 Aug 17 19:28 tzdata1999e.tar.gz -- ---------------. drepper at gnu.org ,-. 1325 Chesapeake Terrace Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA Cygnus Solutions `--' drepper at cygnus.com `------------------------

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tzcode1999e.tar.gz and tzdata1999e.tar.gz
by Olson, Arthur David (NCI) Aug. 17, 1999

Aug. 17, 1999

The files ftp://elsie.nci.nih.gov/pub/tzcode1999e.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata1999e.tar.gz are now available. These files incorporate the changes circulated last week by Paul Eggert on the time zone mailing list, although the change to handling of DST-specifying time zone names has been commented out for now (search for "XXX" in "localtime.c" for details). These files also do not make any changes to the start of DST in Brazil. In addition to Paul's changes, there are updates to "Arts.htm" and cleanups of URLs. I imagine we'll see 1999f shortly with both changes in "localtime.c" and "southamerica"; folks can judge whether to await 1999f before downloading. --ado

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FW: Changes in Brazil's daylight savings
by Olson, Arthur David (NCI) Aug. 17, 1999

Aug. 17, 1999

Ricardo is not on the time zone list; be sure to include Ricardo in replies if appropriate. --ado -----Original Message----- From: Ricardo Reis [SMTP:rreis@ms.com] Sent: Tuesday, August 17, 1999 12:09 PM To: tz(a)elsie.nci.nih.gov Subject: Changes in Brazil's daylight savings Hi, just to inform that Brazil's daylight savings has been changed. Now it will start on Oct 03 1999 and will end on Feb 27 2000. I am attaching a southamerica file that includes this changes, but I am not experienced in this kind of updates, please rewrite it. Regards, Ricardo R. B. Reis <<southamerica.rreis>>

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Changes in Brazil's daylight savings
by Ricardo Reis Aug. 17, 1999

Aug. 17, 1999

Hi, just to inform that Brazil's daylight savings has been changed. Now it will start on Oct 03 1999 and will end on Feb 27 2000. I am attaching a southamerica file that includes this changes, but I am not experienced in this kind of updates, please rewrite it. Regards, Ricardo R. B. Reis

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RE: tz changes for Australia 2000 Olympics, Jordan, Poland, Brazi l, etc.
by Olson, Arthur David (NCI) Aug. 16, 1999

Aug. 16, 1999

... * Modify localtime.c to default to the current US rules if the TZ string specifies DST without rules, and if we can't load the default rules. ... + if (*name == '\0' && load_result != 0) + /* + ** Default to current US rules if TZ has no rules + ** and we can't load the default rules, + */ + name = ",M4.1.0,M10.5.0"; ... At the least we may want to refer to "US rules as of 1999-08-16" rather than "current US rules." We may also want to cite chapter and verse of an international standard (if applicable) to explain why U.S. rules are being used (to avoid bashing of U.S. computer imperialists). --ado

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DST changes in australasia due to 2000 Olympics
by cfields＠kapaa.eng.sun.com Aug. 11, 1999

Aug. 11, 1999

I am fixing a zoneinfo bug in Solaris. One of our customers has pointed out that daylight saving should be fixed for NSW due to the Sydney Olympics. The NSW government web site, http://dir.gis.nsw.gov.au/cgi-bin/genobject/document/other/daylightsaving/t… shows the following: -------- Daylight saving will commence on the last Sunday in October at 2:00am EST and continue until the last Sunday in March at 3:00am EDST. 1998 - 1999 Start: Sunday October 25, 1998 Finish: Sunday March 28, 1999 1999 - 2000 Start: Sunday October 31, 1999 Finish: Sunday March 26, 2000 2000 - 2001 Start: Sunday August 27, 2000 Finish: Sunday March 25, 2001 (Starting at 2.00am and Finishing at 2.00am) -------- In tzdata1999d (australasia 7.46), Rule AV and AN show the daylight saving change on Aug 26 in 2000. Would the following fix the correct set of timezones that are adopting this change? % diff australasia australasia.fix 116c116 < Rule AV 2000 only - Aug 26 2:00s 1:00 - --- > Rule AV 2000 only - Aug lastSun 2:00s 1:00 - 136c136 < Rule AN 2000 only - Aug 26 2:00s 1:00 - --- > Rule AN 2000 only - Aug lastSun 2:00s 1:00 - Carol Fields carol.fields(a)eng.sun.com

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FW: correction for tzdata/leapseconds
by Olson, Arthur David (NCI) July 22, 1999

July 22, 1999

Please include Michael Deckers in any replies; Michael is not part of the time zone mailing list. --ado -----Original Message----- From: Michael Deckers [SMTP:Michael.Deckers@mch6.siemens.de] Sent: Thursday, July 22, 1999 6:29 AM To: tz(a)elsie.nci.nih.gov Subject: correction for tzdata/leapseconds Just a quibble in the file "@(#)leapseconds 7.11" in ftp://elsie.nci.nih.gov/pub/tzdata1999d.tar.gz: # The International Earth Rotation Service periodically uses leap seconds # to keep UTC to within 0.9 s of TAI (atomic time); see ***************** This becomes correct only with UT1 in place of TAI. For instance: within 0.9 s of UT1 (Universal Time 1, the primary time scale measuring the rotation of the Earth) Since the rates of UTC and TAI are the same, the difference between TAI and UTC increases at each instant a leap second is inserted in UTC; currently it is 32 s. ------------------------------------------------------------------------ Michael H Deckers email: Michael.Deckers(a)mch6.siemens.de ---------------------------- end of mail -------------------------------

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correction for tzdata/leapseconds
by Michael Deckers July 22, 1999

July 22, 1999

Just a quibble in the file "@(#)leapseconds 7.11" in ftp://elsie.nci.nih.gov/pub/tzdata1999d.tar.gz: # The International Earth Rotation Service periodically uses leap seconds # to keep UTC to within 0.9 s of TAI (atomic time); see ***************** This becomes correct only with UT1 in place of TAI. For instance: within 0.9 s of UT1 (Universal Time 1, the primary time scale measuring the rotation of the Earth) Since the rates of UTC and TAI are the same, the difference between TAI and UTC increases at each instant a leap second is inserted in UTC; currently it is 32 s. ------------------------------------------------------------------------ Michael H Deckers email: Michael.Deckers(a)mch6.siemens.de ---------------------------- end of mail -------------------------------

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