A free app for Android, by Androcalc.

Working Hours – Timecard

This app is a timecard and attendance system for your business or company. It can be used for any type of work, from a small business to a large corporation. It’s easy to use, and the interface is very intuitive. With this app, you can easily keep track of the hours you worked and overtime calculation.

How does it work?

The basic idea of the app is to have a timeclock that can be used to keep track of the hours you worked. You can enter the start and end time for each day and press the Calc button. You will be able to track the total hours you worked for the entire month and the amount of overtime you are entitled to.