👋 I had raised a similar issue previously #1971, which was for "D M d yy" format. I have found that the same problem happens with `dd. MM yy` format too. Please check this minimal example to recreate the problem.: https://jsfiddle.net/smnt1o5r/2/ Please note that the dates passed to the callback function are of 2031, which is very random <img width="1235" alt="Image" src="https://github.com/user-attachments/assets/2cf1029f-f80e-4004-83fc-05daf255946b" /> I also noticed that this time the problem is not dependent on `dayNamesShort`