TimeZone.dstInEffect

bool dstInEffect(long stdTime) @safe const scope nothrow;

Takes the number of hnsecs (100 ns) since midnight, January 1st, 1 A.D. in UTC time (i.e. std time) and returns whether DST is effect in this time zone at the given point in time.

Parameters

stdTime The UTC time that needs to be checked for DST in this time zone.