Struggling with date format

Debasmita23 When you imported the dates, Excel did not recognise 31/03 as a valid date. On the other hand, 04/01 was recognised, it was "translated" to April 1, where the data probably represents 4 January. Hence, column A became a mix of valid dates (though wrong) and texts.

I used "text-to-comlumns" (on the Data ribbon) to fix this so that a custom format can be applied as desired. See attached, and check if this is indeed what you want/need.