Offset from GMT in seconds. Defaults to -1 which means that first found
time zone corresponding to abbr
is returned.
Otherwise exact offset is searched and only if not found then the first
time zone with any offset is returned.
isdst
Daylight saving time indicator. If abbr
doesn't
exist then the time zone is searched solely by
offset
and isdst
.
Return Values
Returns time zone name on success or FALSE on failure.