2.2.1.30 PidTagStartDate Property
Type: PtypTime ([MS-OXCDATA] section 2.11.1)
The PidTagStartDate property ([MS-OXPROPS] section 2.1026) SHOULD be set, and when set, it MUST be equal to the value of the PidLidAppointmentStartWhole property (section 2.2.1.5).