Problem with Date picker

When I enter ! and choose a date, it seems to just bring up the date that i have put in settings - and then displays that date, not the one I have chosen. I picked 13/01/21 and it displays 13/04/20

You aren’t supposed to put a date in settings. You are supposed to put a date format definition in settings, such as YYYY/M/D hh:mma


lol what?

where in settings can a date be inputted