Don't hassle with time tracking software or your phone. Mount a Flic button by your desk. When you start work - click Flic. When you stop working - Click again. Your work hours will be tracked automatically in a Google Spreadsheet.
Then
Add row to spreadsheet
This action will add a single row to the bottom of the first worksheet of a spreadsheet you specify. Note: a new spreadsheet is created after 2000 rows.
Explore more great ways to automate Flic and Google Sheets