TimeStamp

TimeStamp is a simple but handy application that allows you to keep track of the time you spend working.

It allows you to register when you start working and when you finish, and it even has the ability of reminding you when to finish or go home after certain hours have passed. It also informs you how much time is left of work to finish your day. The results can be exported to an Excel spreadsheet, comma separated list and plain text document, specifying the from and to dates, and format (column or row). You can also add lunchtime calculations, customize the workday length and snooze time, choose entry, and view and data storage settings, to name but a few.
What is more, the program features a very simple and intuitive user interface that can be used by anyone, and it is completely free, so there's no excuse for not using it if you are a true workaholic.
In short, TimeStamp will help you keep track of the time you are at work, so that you can be sure you don't work overtime and spend more time doing other activities.