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Mbigint -p
/(..)(..)/;$_=$1>0&&$1<(0,31,30;$_=$1>0&&$1<substr 113130-($_%4==0$_%4?0:1),31,32,31,32,31,31,32,31.31323132313132313231,322*$2,31)[$2]2
Try it online!Try it online!
-p
/(..)(..)/;$_=$1>0&&$1<(0,31,30-($_%4==0),31,32,31,32,31,31,32,31,32,31)[$2]
Try it online!
/(..)(..)/;$_=$1>0&&$1<substr 113130-($_%4?0:1).31323132313132313231,2*$2,2
