WinLogOnView is a simple tool for Windows Vista/7/8/2008 that analyses the security event log of Windows operating system, and detects the date/time that users logged on and logged off. For every time that a user log on/log off to your system, the following information is displayed: Logon ID, User Name, Domain, Computer, Logon Time, Logoff Time, Duration, and network address. 

WinLogOnView also allows you to easily export the logon sessions information to tab-delimited/comma-delimited/html/xml file.