GMT offset fix #27
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GMT offset fix #27
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added 5 commits
November 21, 2015 20:30
tz_shift(_, "UTC") returns 0, but fmt_shift/1 previously did not handle
that. An alternative fix would be for tz_shift(_, "UTC") to return
{'+', 0, 0}.
Previouly when offset_minute's argument was just digits (for example, "+2" instead of "+2:00"), the argument was incorrectly interpreted as minutes when it should be as hours.
Worked around 2015 Uraguay problem by allowing database to be generated for 2016 instead (with "make DATE=2016-01-01").
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Well, the database is still not correct, the clock in GMT+X zone faster than GMT+0, so for example GMT+8 should plus 480 minutes not minus. see commit: dhull@b36ea2c |
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@jacktang I do believe you're right, good sir! Good catch! |
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Fixed the GMT+H and GMT-H entries in tz_database.hrl, in which the UTC offset was too small by a factor of 60. The tz-erl script had a bug in the
offset_minutesfunction where it treated an offset that was a plain integer as the offset in minutes instead of hours. (Most entries use "HH:MM" or "0".)Update
fmt_shiftto handle an argument of0. This is necessary fortz_shift/3, becausetz_shift(_, "UTC")return0instead of{+, 0, 0}, and this can cause a problem when usingtz_shift/3to convert to or from UTC.In tz-erl, made the future date test in zone lines more precise.
In tz-erl, better documented the problem with zone that begin or end using DST in the current year. (But did not solve the problem. This happened in Uruguay in 2015.)