Determines the offset to UTC in effect during a particular @interval
of time in the time zone @tz.
The offset is the number of seconds that you add to UTC time to
arrive at local time for @tz (ie: negative numbers for time zones
west of GMT, positive numbers for east).
Determines the offset to UTC in effect during a particular @interval of time in the time zone @tz.
The offset is the number of seconds that you add to UTC time to arrive at local time for @tz (ie: negative numbers for time zones west of GMT, positive numbers for east).