Use APKPure App
Get Work Time Tracker old version APK for Android
... tracks your daily working time.
Track your daily working time easily. Just start or stop the timer according to your needs. The app supports multiple accounts if you're tracking different projects. Entries can be edited or added manually. A data export as csv files is available as well.
Optionally you can track WiFi connections. The tracking will be done automatically while you're connected to a certain WiFi access point.