The day number is automatically calculated! It is the difference between the start date of your trip and the selected date of your footprint post.
If the number is incorrect or the bookmark icon in your footprint post is simply greyed out, either the footprint date or the start date of your trip is incorrect:
- To edit the start date of your trip, go to the settings of the according trip
- To edit your footprint date, please edit your footprint and choose the correct date