www.timeanddate.com provides different data
Dear sir/madam On this website i find the following data: https://www.timeanddate.com/time/zone/uk/london 2015Sun, 29 Mar, 01:00GMT <https://www.timeanddate.com/time/zones/gmt> → BST <https://www.timeanddate.com/time/zones/bst>+1 hour (DST start)UTC+1h Sun, 25 Oct, 02:00BST <https://www.timeanddate.com/time/zones/bst> → GMT <https://www.timeanddate.com/time/zones/gmt>-1 hour (DST end) <https://www.timeanddate.com/news/time/europe-dst-end-2015.html>UTC 2016 Sun, 27 Mar, 01:00GMT <https://www.timeanddate.com/time/zones/gmt> → BST <https://www.timeanddate.com/time/zones/bst>+1 hour (DST start) <https://www.timeanddate.com/news/time/europe-starts-dst-2016.html>UTC+1h Sun, 30 Oct, 02:00BST <https://www.timeanddate.com/time/zones/bst> → GMT <https://www.timeanddate.com/time/zones/gmt>-1 hour (DST end) <https://www.timeanddate.com/news/time/eu-debate-dst.html>UTC 2017 Sun, 26 Mar, 01:00GMT <https://www.timeanddate.com/time/zones/gmt> → BST <https://www.timeanddate.com/time/zones/bst>+1 hour (DST start)UTC+1h Sun, 29 Oct, 02:00BST <https://www.timeanddate.com/time/zones/bst> → GMT <https://www.timeanddate.com/time/zones/gmt>-1 hour (DST end)UTC 2018 Sun, 25 Mar, 01:00GMT <https://www.timeanddate.com/time/zones/gmt> → BST <https://www.timeanddate.com/time/zones/bst>+1 hour (DST start)UTC+1h Sun, 28 Oct, 02:00BST <https://www.timeanddate.com/time/zones/bst> → GMT <https://www.timeanddate.com/time/zones/gmt>-1 hour (DST end)UTC 2019 Sun, 31 Mar, 01:00GMT <https://www.timeanddate.com/time/zones/gmt> → BST <https://www.timeanddate.com/time/zones/bst>+1 hour (DST start)UTC+1h Sun, 27 Oct, 02:00BST <https://www.timeanddate.com/time/zones/bst> → GMT <https://www.timeanddate.com/time/zones/gmt>-1 hour (DST end)UTC As you can see, the Europe/London time change rule is different every year . But i can not find this information on yor data distribution. https://www.iana.org/time-zones For europe, london you give: # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/London -0:01:15 - LMT 1847 Dec 1 0:00s 0:00 GB-Eire %s 1968 Oct 27 1:00 - BST 1971 Oct 31 2:00u 0:00 GB-Eire %s 1996 0:00 EU GMT/BST Maybe i do not understand how to use your data? I put the question on stackoverflow: http://stackoverflow.com/questions/40360032/iana-internet-assigned-numbers-a... regards, -- *Gintare Statkute*
On Nov 1, 2016, at 5:26 AM, Gintare Statkute <g.statkute@gmail.com> wrote:
On this website i find the following data: https://www.timeanddate.com/time/zone/uk/london
2015Sun, 29 Mar, 01:00GMT → BST+1 hour (DST start)UTC+1h Sun, 25 Oct, 02:00BST → GMT-1 hour (DST end)UTC 2016 Sun, 27 Mar, 01:00GMT → BST+1 hour (DST start)UTC+1h Sun, 30 Oct, 02:00BST → GMT-1 hour (DST end)UTC 2017 Sun, 26 Mar, 01:00GMT → BST+1 hour (DST start)UTC+1h Sun, 29 Oct, 02:00BST → GMT-1 hour (DST end)UTC 2018 Sun, 25 Mar, 01:00GMT → BST+1 hour (DST start)UTC+1h Sun, 28 Oct, 02:00BST → GMT-1 hour (DST end)UTC 2019 Sun, 31 Mar, 01:00GMT → BST+1 hour (DST start)UTC+1h Sun, 27 Oct, 02:00BST → GMT-1 hour (DST end)UTC
As you can see, the Europe/London time change rule is different every year .
2015: the UK changes from standard time to summer time on the last Sunday in March. 2016: the UK changes from standard time to summer time on the last Sunday in March. 2017: the UK changes from standard time to summer time on the last Sunday in March. 2018: the UK changes from standard time to summer time on the last Sunday in March. 2019: the UK changes from standard time to summer time on the last Sunday in March. That's not different every year. The date of the last Sunday in March is different every year, but that's just the way the Gregorian calendar works.
But i can not find this information on yor data distribution. https://www.iana.org/time-zones
For europe, london you give: # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/London -0:01:15 - LMT 1847 Dec 1 0:00s 0:00 GB-Eire %s 1968 Oct 27 1:00 - BST 1971 Oct 31 2:00u 0:00 GB-Eire %s 1996 0:00 EU GMT/BST
That says that, from 1996 on, they used the "EU" rules. Those should also be in the "europe" file; the 2016g file says: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule EU 1977 1980 - Apr Sun>=1 1:00u 1:00 S Rule EU 1977 only - Sep lastSun 1:00u 0 - Rule EU 1978 only - Oct 1 1:00u 0 - Rule EU 1979 1995 - Sep lastSun 1:00u 0 - Rule EU 1981 max - Mar lastSun 1:00u 1:00 S Rule EU 1996 max - Oct lastSun 1:00u 0 - So, from 1981 on, the "EU" rules specify that the time changes to summer time at 1:00 UTC on the last Sunday in March. As Paul Eggert indicated, the "zic" man page describes how those files work.
You may also find the following article to be useful: http://www.iana.org/time-zones/repository/tz-how-to.html ________________________________ From: tz-bounces@iana.org <tz-bounces@iana.org> on behalf of Guy Harris <guy@alum.mit.edu> Sent: Tuesday, November 1, 2016 2:20 PM To: Gintare Statkute Cc: tz@iana.org Subject: Re: [tz] www.timeanddate.com provides different data On Nov 1, 2016, at 5:26 AM, Gintare Statkute <g.statkute@gmail.com> wrote:
On this website i find the following data: https://www.timeanddate.com/time/zone/uk/london Daylight saving time dates for United Kingdom - England ...<https://www.timeanddate.com/time/zone/uk/london> www.timeanddate.com Historic, present and future dates for daylight saving time and clock changes. Time changes between years 2015 and 2019 in United Kingdom - England - London are ...
2015Sun, 29 Mar, 01:00GMT ? BST+1 hour (DST start)UTC+1h Sun, 25 Oct, 02:00BST ? GMT-1 hour (DST end)UTC 2016 Sun, 27 Mar, 01:00GMT ? BST+1 hour (DST start)UTC+1h Sun, 30 Oct, 02:00BST ? GMT-1 hour (DST end)UTC 2017 Sun, 26 Mar, 01:00GMT ? BST+1 hour (DST start)UTC+1h Sun, 29 Oct, 02:00BST ? GMT-1 hour (DST end)UTC 2018 Sun, 25 Mar, 01:00GMT ? BST+1 hour (DST start)UTC+1h Sun, 28 Oct, 02:00BST ? GMT-1 hour (DST end)UTC 2019 Sun, 31 Mar, 01:00GMT ? BST+1 hour (DST start)UTC+1h Sun, 27 Oct, 02:00BST ? GMT-1 hour (DST end)UTC
As you can see, the Europe/London time change rule is different every year .
2015: the UK changes from standard time to summer time on the last Sunday in March. 2016: the UK changes from standard time to summer time on the last Sunday in March. 2017: the UK changes from standard time to summer time on the last Sunday in March. 2018: the UK changes from standard time to summer time on the last Sunday in March. 2019: the UK changes from standard time to summer time on the last Sunday in March. That's not different every year. The date of the last Sunday in March is different every year, but that's just the way the Gregorian calendar works.
But i can not find this information on yor data distribution. https://www.iana.org/time-zones IANA - Time Zone Database<https://www.iana.org/time-zones> www.iana.org Time Zone Database. The Time Zone Database (often called tz or zoneinfo) contains code and data that represent the history of local time for many representative ...
For europe, london you give: # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/London -0:01:15 - LMT 1847 Dec 1 0:00s 0:00 GB-Eire %s 1968 Oct 27 1:00 - BST 1971 Oct 31 2:00u 0:00 GB-Eire %s 1996 0:00 EU GMT/BST
That says that, from 1996 on, they used the "EU" rules. Those should also be in the "europe" file; the 2016g file says: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule EU 1977 1980 - Apr Sun>=1 1:00u 1:00 S Rule EU 1977 only - Sep lastSun 1:00u 0 - Rule EU 1978 only - Oct 1 1:00u 0 - Rule EU 1979 1995 - Sep lastSun 1:00u 0 - Rule EU 1981 max - Mar lastSun 1:00u 1:00 S Rule EU 1996 max - Oct lastSun 1:00u 0 - So, from 1981 on, the "EU" rules specify that the time changes to summer time at 1:00 UTC on the last Sunday in March. As Paul Eggert indicated, the "zic" man page describes how those files work.
participants (4)
-
Gintare Statkute -
Guy Harris -
Matt Johnson -
Paul Eggert