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Returns true if this time zone has a future transition to or from daylight savings time.
Warning: this returns false for time zones like Asia/Kuala_Lumpur that have previously used DST but do not currently. A hypothetical country that has never observed daylight savings before but plans to start next year would return true.
Warning: this returns true for time zones that use DST, even when it is not active.
Use TimeZone.InDaylightTime(Date) to find out whether daylight savings is in effect at a specific time.
Most applications should not use this method.