Support for displaying these sorts of large integer attributes has been added to PeopleUpdate/PeopleSearch v4.6. For more information, check out: https://www.youtube.com/watch?v=ag9YFdvF-ms . This article discusses how to display the pwdLastSet value in PeopleUpdate as a non-numeric date value (and attributes like it in Active Directory).
Active Directory uses several different syntaxes to store data internally. Among the more interesting is the large integer syntax that’s often used to store date and time data.
More Information about pwdLastSet The pwdLastSet attribute stores the date and time that the password for a user account was last changed. This value is stored as a large integer that represents the number of 100 nanosecond intervals since January 1, 1601 (UTC). Check out http://msdn.microsoft.com/en-us/library/windows/desktop/ms679430(v=vs.85).aspx for full information.