How to check if a string is a legal “dd/mm/yyyy” date?

Question

Given a string str, how could I check if it is in the dd/mm/yyyy format and contains a legal date ?

Some examples:

bla bla          


        

Answer 1

Personally, I think the best solution would be to modify the UI to use dropdowns for the month and possibly day selections.

Trying to figure out if 1/2/2001 is January 2nd or February 1st based solely on that input string is impossible.