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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.62 2009/01/01 17:24:04 momjian Exp $
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* $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.63 2009/06/11 14:49:15 momjian Exp $
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*-------------------------------------------------------------------------
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* enough to identify DST transition rules, since everybody switches on
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* Sundays.) This is sufficient to cover most of the Unix time_t range,
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* and we don't want to look further than that since many systems won't
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* have sane TZ behavior further back anyway. The further
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* back the zone matches, the better we score it. This may seem like a
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* rather random way of doing things, but experience has shown that
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* system-supplied timezone definitions are likely to have DST behavior
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* that is right for the recent past and not so accurate further back.
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* Scoring in this way allows us to recognize zones that have some
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* commonality with the zic database, without insisting on exact match.
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* (Note: we probe Thursdays, not Sundays, to avoid triggering
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* DST-transition bugs in localtime itself.)
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* have sane TZ behavior further back anyway. The further back the zone
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* matches, the better we score it. This may seem like a rather random
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* way of doing things, but experience has shown that system-supplied
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* timezone definitions are likely to have DST behavior that is right for
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* the recent past and not so accurate further back. Scoring in this way
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* allows us to recognize zones that have some commonality with the zic
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* database, without insisting on exact match. (Note: we probe Thursdays,
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* not Sundays, to avoid triggering DST-transition bugs in localtime
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tnow = time(NULL);
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tm = localtime(&tnow);
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thisyear = tm->tm_year + 1900;
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t = build_time_t(thisyear, 1, 15);
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* Round back to GMT midnight Thursday. This depends on the knowledge
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* that the time_t origin is Thu Jan 01 1970. (With a different origin
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"Central Standard Time (Mexico)", "Central Daylight Time (Mexico)",
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"America/Mexico_City"
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}, /* (GMT-06:00) Guadalajara, Mexico City,
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"China Standard Time", "China Daylight Time",
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"Mountain Standard Time (Mexico)", "Mountain Daylight Time (Mexico)",
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"America/Chihuahua"
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}, /* (GMT-07:00) Chihuahua, La Paz,
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}, /* (GMT-07:00) Chihuahua, La Paz, Mazatlan -
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"Myanmar Standard Time", "Myanmar Daylight Time",
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"Australia/Perth"
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}, /* (GMT+08:00) Perth */
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/* {"W. Central Africa Standard Time", "W. Central Africa Daylight Time",
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* * * * * * * ""}, Could not find a match for this one. Excluded for now. *//* (
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* * * * * * * * ""}, Could not find a match for this one. Excluded for now. *//* (
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* G MT+01:00) West Central Africa */
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"W. Europe Standard Time", "W. Europe Daylight Time",
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* Load this timezone using tzload() not pg_tzset(), so we don't fill
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if (tzload(fullname + dir->baselen, dir->tz.TZname, &dir->tz.state,
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if (tzload(fullname + dir->baselen, dir->tz.TZname, &dir->tz.state,
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/* Zone could not be loaded, ignore it */
added
removed
src/timezone/pgtz.c
