package calendar

Type of a time zone.

Return the current time zone. It is UTC before any change.

Change the current time zone by another one. Raise Invalid_argument if the specified time zone is UTC_Plus x with x < -12 or x > 11

Return the gap between two time zone. @example gap UTC (UTC_Plus 5) returns 5 and, at Paris in summer, gap Local UTC returns -2.

from_gmt () is equivalent to gap UTC (current ()).

to_gmt () is equivalent to gap (current ()) UTC.

is_dst () checks if daylight saving time is in effect. Only relevant in local time. Returns alway false in another time zone.

• since 1.09.4

hour_of_dst () returns 1 if is_dst () and 0 otherwise.

• since 1.09.4

on f tz x changes the time zone to tz, then computes f x, and finally reset the time zone to the initial one and returns the result of the computation.

• since 2.0