Storing login and logout time

[eluser]Aqsa Jamil[/eluser]
I want to implement a functionality to create profile for the newly registered user. for that i need to check log-in and log-out time in order to determine if the user is newly registered user or not, if login and logout time is NULL then the create profile interface will be displayed for that user to create profile. if Not NULL then user will be redirected to some other page
Can any one give me some idea about how to write code in Model and Controller for that???