Em 2013-06-30 23:59, Stas Malyshev escreveu:
I have a question about IntlTimeZone::getOffset - what is the first
parameter it accepts? Is it UTC timestamp? The type is double, but
I'm
not sure what exactly this double is supposed to mean.
It can be a UTC timestamp (if $local is false), but note it's in
milliseconds since the epoch, not seconds. The documentation is here:
http://www.icu-project.org/apiref/icu4c/classicu_1_1TimeZone.html#a026e66c6f698915089c3a3ab29dfd80b
And for UDate (which is typedefed to double in ICU4C and represented as
a float in PHP):
http://www.icu-project.org/apiref/icu4c/utypes_8h.html#ace1704e9e77d407d1eaaa2e73ec0c039
If $local is false, then it's a "local" timestamp; from what I can
tell, this is the UTC timestamp of the relevant instant + effective
timezone offset at that instant. Put another way, the local timestamp is
the UTC timestamp that would yield the same UTC date/time as the local
wall time at issue. This has the usual problems at DST transitions, see
this comment:
http://lxr.php.net/xref/THIRD_PARTY/ICU4C/source/i18n/timezone.cpp#661
--
Gustavo Lopes
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