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Sync our copy of the timezone library with IANA release tzcode2018e.

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The non-cosmetic changes involve teaching the "zic" tzdata compiler about
negative DST.  While I'm not currently intending that we start using
negative-DST data right away, it seems possible that somebody would try
to use our copy of zic with bleeding-edge IANA data.  So we'd better be
out in front of this change code-wise, even though it doesn't matter for
the data file we're shipping.

Discussion: https://postgr.es/m/30996.1525445902@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2018-05-04 12:26:25 -04:00
parent 59cb323053
commit b45f6613e0
4 changed files with 129 additions and 46 deletions
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14
src/timezone/localtime.c
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@ -60,9 +60,8 @@ static int tzdefrules_loaded = 0;
/*
* The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
* Default to US rules as of 2017-05-07.
* POSIX 1003.1 section 8.1.1 says that the default DST rules are
* implementation dependent; for historical reasons, US rules are a
* common default.
* POSIX does not specify the default DST rules;
* for historical reasons, US rules are a common default.
*/
#define TZDEFRULESTRING ",M3.2.0,M11.1.0"
@ -1158,10 +1157,11 @@ tzparse(const char *name, struct state *sp, bool lastditch)
else
{
/*
* If summer time is in effect, and the transition time
* was not specified as standard time, add the summer time
* offset to the transition time; otherwise, add the
* standard time offset to the transition time.
* If daylight saving time is in effect, and the
* transition time was not specified as standard time, add
* the daylight saving time offset to the transition time;
* otherwise, add the standard time offset to the
* transition time.
*/
/*