Dayshare saves your registers to enable you to look back and track a child's attendance over a period of time. 

By default, Dayshare will show today's register, however, you can view historical registers by clicking/tapping on the calendar  button and selecting a date to view the register for that day:

Whilst you are viewing a historical register, the calendar button will be highlighted in red:  

Once you have finished viewing a historical register, you can return to today's register by clicking/tapping on the calendar button again and selecting today's date.