Book'Mee records your time spent at work.
Features : 
Configure : Your work profile - start time for working day , end time for working day , lunch break time, days off
Manual actions : START recording ( comment , option: set a past time ) END recording ( comment, option : set a past time)
Statistics : Computed extra time, time spent at work per day & month, previous months ...
Daily Notifications: reminders for day start & end

Enjoy!