!!! Overview
[{$pagename}] is an [attribute] in [Microsoft Active Directory] and is the [date|Time] when this object was last changed.[{$pagename}] value is __not replicated__ and exists in the [Global Catalog].[modifyTimestamp] is marked as [Constructed Attribute] (effectively an alias for [whenChanged]) [1]

[{$pagename}] is marked "NOT REPLICATED(1)" which will require the application to query all DCs in the [Domain] for most recent value when comparing the attribute and security stamp.!! [LDAP] [Microsoft Active Directory Attribute] Definition
The [{$pagename}] [AttributeTypes] is defined as:
* [CN|Cn]: When-Changed
* [OID] of [1.2.840.113556.1.2.3] 
* [NAME|Attribute-Name]: [{$pagename}]
* [DESC]: 
* [EQUALITY]: []
* [ORDERING]: []
* [SYNTAX]:  1.3.6.1.4.1.1466.115.121.1.24 [GeneralizedTime]
* [LOWERBOUND]:
* [UPPERBOUND]: 
* [OMSyntax]: 
* [SchemaIDGUID]: [bf967a77-0de6-11d0-a285-00aa003049e2]
* [mapiID]: 0x3008
* [SINGLE-VALUE]
* [NO-USER-MODIFICATION]
* [USAGE]: [UserApplications] 
* [Extended Flags]: 
** [X-ORIGIN]: [Microsoft Active Directory]
* [X-SYSTEMFLAGS]
** [FLAG_ATTR_NOT_REPLICATED]
** [FLAG_ATTR_REQ_PARTIAL_SET_MEMBER]
** [FLAG_SCHEMA_BASE_OBJECT]
* [X-SCHEMAFLAGSEx]
* [X-SEARCH-FLAGS]
* Used as [MUST] in:
** (none)
* Used as [MAY] in:
** 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [whenChanged and modifyTimeStamp|http://blog.joeware.net/2006/10/03/655/|target='_blank'] - based on information obtained 2016-06-01-