On 2019-09-12 20:21, Zoidiasoft Technologies wrote:
Just wondering how to interpret the following: Rule Turkey 1977 1978 - Apr Sun>=1 2:00 1:00 S Rule Turkey 1977 1978 - Oct Sun>=15 2:00 0 - Rule Turkey 1978 only - Jun 29 0:00 0 - The problem is with 1978 which seems to have two end dates for DST. Knowing this country has Ramadan, did I miss a rule for standard time onset at the start of Ramadan in 1978?
Elections are another major source of interference with the regular timing of daylight saving transitions. RTSL: especially the tzdata/europe Turkey comments, and also the Istanbul zone data, not just the Turkey rules: # http://www.resmigazete.gov.tr/arsiv/16245.pdf#page=17 # This cancels the previous decision, and repeats it only for 1978. # 1978-04-02 02:00 -> 03:00, 1978-10-15 02:00 -> 01:00 # (not applied due to standard TZ change below) # # http://www.resmigazete.gov.tr/arsiv/16331.pdf#page=3 # This decision changes the default longitude for Turkish time zone from 30 # degrees East to 45 degrees East. This means a standard TZ change, from +2 # to +3. This is published & applied on 1978-06-29. At that time, Turkey was # already on summer time (already on 45E). Hence, this new law just meant an # "continuous summer time". Note that this was reversed in a few years. # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Europe/Istanbul 1:55:52 - LMT 1880 1:56:56 - IMT 1910 Oct # Istanbul Mean Time? 2:00 Turkey EE%sT 1978 Jun 29 3:00 Turkey +03/+04 1984 Nov 1 2:00 $ zdump -Vc1978,1979 Europe/Istanbul Europe/Istanbul Sat Apr 1 21:59:59 1978 UT = Sat Apr 1 23:59:59 1978 EET isdst=0 gmtoff=7200 Europe/Istanbul Sat Apr 1 22:00:00 1978 UT = Sun Apr 2 01:00:00 1978 EEST isdst=1 gmtoff=10800 Europe/Istanbul Sat Oct 14 20:59:59 1978 UT = Sat Oct 14 23:59:59 1978 EEST isdst=1 gmtoff=10800 Europe/Istanbul Sat Oct 14 21:00:00 1978 UT = Sun Oct 15 01:00:00 1978 +04 isdst=1 gmtoff=14400 -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised.