Are you a freelancer? Do you want to know your worked hours?
"Worked time" will be useful tu you, you can add in an easy way your worked hours, the app automatically will calculate the lapsed time and will add it to a database allowing to know the worked time by day in a month a specificied year.
Permissions required:
VIBRATE: Pressed button make use of vibration
WRITE_EXTERNAL_STORAGE: You can export or import your database to the SD card in order to do a security copy