Did you add your progress pic?
If you’ve added your progress pic and marked everything complete but it’s still showing your day from yesterday, this issue is most often caused when someone changes their end-of-day time to an earlier time that has already passed before their day has ended.
The workaround to fix this without editing your progress would be:
1. Go to your settings and set your end of day time for 5 minutes from now.
2. Close the app, and come back in 10 minutes or so. It should have moved you on to the next day.
3. Go and change your end of day time back to tonight whenever you want it to be.
You should be on the correct day and can mark everything from today complete.