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This property corresponds to the System.TimeZoneInfo.AdjustmentRule.DateStart property. Generally, the TimeZoneInfo class is a more accurate source of information on time zone adjustments than the TimeZone and System.Globalization.DaylightTime classes.
When the daylight saving period begins, the clock time is advanced by the number of ticks defined by the DaylightTime.Delta property to take advantage of the extended daylight hours.