DTSTAMP

Purpose: In the case of an iCalendar object that specifies a "METHOD" property, this property specifies the date and time that the instance of the iCalendar object was created. In the case of an iCalendar object that doesn't specify a "METHOD" property, this property specifies the date and time that the information associated with the calendar component was last revised in the calendar store. It is saved as UNIX timestamp (milliseconds). See [https://tools.ietf.org/html/rfc5545#section-3.8.7.2] Type: Long