This specification modifies the definition of the "LAST-MODIFIED" property to allow it to be defined in an iCalendar object. The following additions are made to the definition of this property, originally specified in Section 3.8.7.3 of [RFC5545].
Purpose
This property specifies the date and time that the information associated with the calendar was last revised.
Conformance
This property can be specified once in an iCalendar object.