Why every box has a date
Most challenge sheets are thirty numbered circles. Miss a day and the next tick goes in the next empty circle, so day 12 ends up on the 14th and the challenge quietly becomes 32 days. Nobody notices, including you.
Here every box carries its date and weekday. Tick the box for today, and a missed day stays empty where it belongs. That is harsher to look at, and far more useful.