Badge, Hide & Show
The red badge can be set to show the current day or the week number or other calendar information.
- Go to System Settings
- Go to Week Cal
- Go to Notifications
- Enable Badge App Icon
- Reboot your device
- In app go to Settings > General > Badge and select the option you want
Apple doesn't allow third party apps to show a dynamic icon, we would love to have one instead of a badge.