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I had raised a similar issue previously#1971, which was for "D M d yy" format. I have found that the same problem happens withdd. 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

I also noticed that this time the problem is not dependent ondayNamesShort