Numbers at bottom of planner

Does anybody know what the random numbers are on the tabs at the bottom of the screen? I've figured that the blue tab with the twisted arrow is like an ongoing planner for one particular class...

Once you have a timetable running, what I see on these is:
- 1 for today
- 7 for the whole week
- 31 for the whole month
Then the twisted arrow is new with the update and it's great for seeing on a really long term the whole of your planning.
Hope it helps.