Week Numbers can be displayed on both Android and iOS devices.
Week Numbers are displayed on both the 'Monthly' and 'Weekly' calendar views of TimeTree.
Instructions:
- Tap the three horizontal lines in the top left hand corner of the screen
- Tap the "App Settings" button on the upper right corner.
- Navigate to "Week Numbers" and set switch to your preference, ensuring that your selection is highlighted.
Relevant: Change of start day