[tz] Europe/London Sat Oct 26 23:00:00 1968 UT
Brian Inglis
Brian.Inglis at systematicsw.ab.ca
Mon Sep 15 05:25:01 UTC 2014
On 2014-09-14 22:40, "" wrote:
> Looks like isdst should be 1 on
> Europe/London Sat Oct 26 23:00:00 1968
> and
> Europe/London Sun Oct 31 01:59:59 1971
> zdump -v -c 1968,1973 Europe/London
> Europe/London -9223372036854775808 = NULL
> Europe/London -9223372036854689408 = NULL
> Europe/London Sun Feb 18 01:59:59 1968 UT = Sun Feb 18 01:59:59 1968 GMT isdst=0 gmtoff=0
> Europe/London Sun Feb 18 02:00:00 1968 UT = Sun Feb 18 03:00:00 1968 BST isdst=1 gmtoff=3600
> Europe/London Sat Oct 26 22:59:59 1968 UT = Sat Oct 26 23:59:59 1968 BST isdst=1 gmtoff=3600
> Europe/London Sat Oct 26 23:00:00 1968 UT = Sun Oct 27 00:00:00 1968 BST isdst=0 gmtoff=3600
> Europe/London Sun Oct 31 01:59:59 1971 UT = Sun Oct 31 02:59:59 1971 BST isdst=0 gmtoff=3600
> Europe/London Sun Oct 31 02:00:00 1971 UT = Sun Oct 31 02:00:00 1971 GMT isdst=0 gmtoff=0
> Europe/London Sun Mar 19 01:59:59 1972 UT = Sun Mar 19 01:59:59 1972 GMT isdst=0 gmtoff=0
> Europe/London Sun Mar 19 02:00:00 1972 UT = Sun Mar 19 03:00:00 1972 BST isdst=1 gmtoff=3600
> Europe/London Sun Oct 29 01:59:59 1972 UT = Sun Oct 29 02:59:59 1972 BST isdst=1 gmtoff=3600
> Europe/London Sun Oct 29 02:00:00 1972 UT = Sun Oct 29 02:00:00 1972 GMT isdst=0 gmtoff=0
> Europe/London 9223372036854689407 = NULL
> Europe/London 9223372036854775807 = NULL
The relevant rules, comments, and zones to examine in data/europe are:
# Summer Time Order, 1968 (S.I. 1968/117)
Rule GB-Eire 1968 only - Feb 18 2:00s 1:00 BST
# The British Standard Time Act, 1968
# (no summer time)
# The Summer Time Act, 1972
Rule GB-Eire 1972 1980 - Mar Sun>=16 2:00s 1:00 BST
Rule GB-Eire 1972 1980 - Oct Sun>=23 2:00s 0 GMT
and:
# 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
which gives 1968 Oct 27 midnight as the transition from British Summer Time
isdst=1 to British Standard Time isdst=0 both with GMT offset +1.00, from
the British Standard Time Act 1968 c. 45, whichended itself effective
1971 Oct 31 2.00 GMT.
See http://polyomino.org.uk/british-time and search for "1968 c. 45".
--
Take care. Thanks, Brian Inglis
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