This is the time that the user last logged into the domain. This value is stored as a large integer that represents the number of 100-nanosecond intervals since January 1, 1601 (UTC). Whenever a user logs on, the value of this attribute is read from the DC. If the value is older [ current_time - msDS-LogonTimeSyncInterval ], the value is updated. The initial update after the raise of the domain functional level is calculated as 14 days minus random percentage of 5 days.
This value is set by the system.
When the user logs on, and if this value is older than the current time minus the value of msDS-LogonTimeSyncInterval.