I'm not sure how this hasn't been addressed its been a bug for the life of the game from what I can tell, I've noticed before it but never reported it, so shame on me.

Create a character, go to absolutely any month in the character creator's date of birth selection screen, when you hover on the last day of the month you'll find that the date verbally and the date numerically do not match. This is an issue with every single month, some months have it worse than others, for instance there are 32 days in the First Umbral Moon, yet when you hover over the last day you will see that the numerical date is marked as (2/29), you can see that the 7th and the 8th both points to (2/7), that the 15th and 16th both point to (2/14), the 23rd and 24th both point to (2/21), hence why the last day is marked numerically as (2/29) rather than the correct (2/32).

This same issue occurs in every month, this isn't a one off thing.