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  5. 3.8.7.2. Date-Time Stamp 

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#  3.8.7.2. Date-Time Stamp

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##  Property Name

DTSTAMP

##  Purpose

In the case of an iCalendar object that specifies a [ "METHOD" ](/iCalendar-
RFC-5545/3-7-2-method.html) 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" ](/iCalendar-
RFC-5545/3-7-2-method.html) property, this property specifies the date and
time that the information associated with the calendar component was last
revised in the calendar store.

##  Value Type

DATE-TIME

##  Property Parameters

IANA and non-standard property parameters can be specified on this property.

##  Conformance

This property MUST be included in the [ "VEVENT" ](/iCalendar-
RFC-5545/3-6-1-event-component.html) , [ "VTODO" ](/iCalendar-
RFC-5545/3-6-2-to-do-component.html) , [ "VJOURNAL" ](/iCalendar-
RFC-5545/3-6-3-journal-component.html) , or [ "VFREEBUSY" ](/iCalendar-
RFC-5545/3-6-4-free-busy-component.html) calendar components.

##  Description

The value MUST be specified in the UTC time format.

This property is also useful to protocols such as [2447bis] that have inherent
latency issues with the delivery of content. This property will assist in the
proper sequencing of messages containing iCalendar objects.

In the case of an iCalendar object that specifies a [ "METHOD" ](/iCalendar-
RFC-5545/3-7-2-method.html) property, this property differs from the [
"CREATED" ](/iCalendar-RFC-5545/3-8-7-1-date-time-created.html) and "LAST-
MODIFIED" properties. These two properties are used to specify when the
particular calendar data in the calendar store was created and last modified.
This is different than when the iCalendar object representation of the
calendar service information was created or last modified.

In the case of an iCalendar object that doesn't specify a [ "METHOD"
](/iCalendar-RFC-5545/3-7-2-method.html) property, this property is equivalent
to the [ "LAST-MODIFIED" ](/iCalendar-RFC-5545/3-8-7-3-last-modified.html)
property.

##  Format Definition

This property is defined by the following notation:

    
    
     dtstamp    = ["DTSTAMP"](/iCalendar-RFC-5545/3-8-7-2-date-time-stamp.html) stmparam ":" date-time CRLF
    
    
     stmparam   = *(";" other-param)

##  Example

    
    
     DTSTAMP:19971210T080000Z

[ Previous article: 3.8.7.1. Date-Time Created  Prev  ](/iCalendar-
RFC-5545/3-8-7-1-date-time-created.html) [ Next article: 3.8.7.3. Last
Modified  Next  ](/iCalendar-RFC-5545/3-8-7-3-last-modified.html)

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