The DaylightDay property specifies the day of the DaylightMonth when the transition from standard time to daylight savings ...

The DaylightDay property specifies the day of the DaylightMonth when the transition from standard time to daylight savings time occurs on this operating system. 

Example: 15 
The property specifies a SYSTEMTIME structure that contains a date and local time when the transition from standard time to daylight time occurs on this operating system. If this date is not specified, the wMonth member in the SYSTEMTIME structure must be zero. If this date is specified, the StandardDate value in the TIME_ZONE_INFORMATION structure must also be specified. This member supports the absolute and day-in-month time formats described for the StandardDate member.
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