With this app i have solved all my problems.
Really simple and fast.
You can insert your works hour day by day and you can analize all entry for year, month, week.
But unlike the other app you can choose to analyze the work done between two date.
Lastly you can save your data entry to cvs, pdf, email or dropbox!
Marco weee about TimeTrack for Freelancers, v2.2.1