regular expression to validate datetime format (MM/DD/YYYY) [duplicate]

Question

I am trying to validate datetime format MM/DD/YYYY. Here is the code I am trying please help.

 function ValidateDate(testdate) {         var Status         var reg = /^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/g;         if (!reg.test(testdate)) {             Status = false;         }         return Status;     } 

Answer 1

Try your regex with a tool like http://jsregex.com/ (There is many) or better, a unit test.

For a naive validation:

function validateDate(testdate) {     var date_regex = /^\d{2}\/\d{2}\/\d{4}$/ ;     return date_regex.test(testdate); } 

In your case, to validate (MM/DD/YYYY), with a year between 1900 and 2099, I'll write it like that:

function validateDate(testdate) {     var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/ ;     return date_regex.test(testdate); }