The TimeFirst property sets filtering on whether a message was received at or since the specified date/time. Read/write.
objMessageFilter.TimeFirst
Variant (vbDate format)
If the TimeFirst property is not set, the message filter passes all messages received at or before the date/time in the TimeLast property. If neither property is set, the filter passes messages regardless of their date/time of reception.
The TimeFirst and TimeLast properties represent local time.
The TimeFirst property corresponds to the MAPI Property PR_MESSAGE_DELIVERY_TIME.