This app was mentioned in 4 comments, with an average of 1.25 upvotes
If you're still looking I use Shift Tracker: https://play.google.com/store/apps/details?id=com.dgsd.android.ShiftTracker
You pick the date of said work you put the starting and ending times maybe put down how much you make an hour then save and bam! And you can track how much you'll be making for that week. (minus taxes, out you can put the taxes on if you know how much it is in % in the settings)
I use Shift tracker
For all you people who are paid by the hour, check out shift tracker. Just updated to Material Design.