Internet Direct (Indy) Version 9.0.2 Beta
TIdHTTPSession.LastTimeStamp
Specifies the date and time a session was last modified.

property LastTimeStamp: TDateTime;
Description
LastTimeStamp is a read-only TDateTime property that identifies the date and time that a HTTP session was last modified. LastTimeStamp is used with the SessionTimeOut value from TIdHTTPDefaultSessionList to determine when a persistent HTTP session has expired.

LastTimeStamp is updated when a HTTP session is created or accessed for use with a HTTP request or response by TIdHTTPServer.