Retrieves the offset from UTC in hours that the timezone specified
by datetime represents. Timezones ahead (to the east) of UTC have positive
values, timezones before (to the west) of UTC have negative values.
If datetime represents UTC time, then the offset is zero.
Retrieves the offset from UTC in hours that the timezone specified by datetime represents. Timezones ahead (to the east) of UTC have positive values, timezones before (to the west) of UTC have negative values. If datetime represents UTC time, then the offset is zero.