regular expression for date in any format in javascript?

Question

regular expression for date in any format in javascript

The format includes: dd/mm/yyyy or mm/dd/yyyy or yyyy/dd/mm or dd-yy-mmmm or ddmmyyyy like so on.....

can any one help please??

Answer 1

There is no "perfect" parse but I would suggest using something like datejs for handling dates in javascript. It can handle a number of parsing routines with a wide variety of format support.

Answer 2

Reg Ex for dates with leap year consideration. Wrote it for as3, but since js and as3 are both derivative of ECMAScript, it should work fine in JS too.

Change # in the reg ex with your desired date separator. For a global separator replace # with (/|-|.)

For DD-MM-YYYY format

^(?:31#(?:(?:0[13578])|(?:1[02]))#)|(?:(?:29|30)#(?:(?:0[1,3-9])|(?:1[0-2]))#)(?:(?:1[6-9]|[2-9]\d)\d{2})$|^(?:29#02#(?:(?:(?:1[6-9]|[2-9]\d)(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:(?:0[1-9])|(?:1\d)|(?:2[0-8]))#(?:(?:0[1-9])|(?:1[0-2]))#(?:(?:1[6-9]|[2-9]\d)\d{2})$

For MM-DD-YYYY format

^(?:(?:(?:0?[13578]|1[02])#31)\1|(?:(?:0?[1,3-9]|1[0-2])#(?:29|30)\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:0?2#29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:(?:0?[1-9])|(?:1[0-2]))#(?:0?[1-9]|1\d|2[0-8])\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$

Tests with performance.

29-02-2000 ---> true
millis 2
29-02-2006 ---> false
millis 0
29-02-2001 ---> false
millis 0
30-02-2000 ---> false
millis 0
31-11-2000 ---> false
millis 0
29-13-2000 ---> false
millis 0
31-11-2000 ---> false
millis 0
31-07-2000 ---> true
millis 0
31-08-2000 ---> true
millis 1
31-12-2000 ---> true
millis 0
30-11-2011 ---> true
millis 0
17-07-2011 ---> true
millis 0
04-10-1987 ---> true
millis 0
01-01-1900 ---> true
millis 0
24-05-88 ---> false
millis 0
24-05-88 ---> false
millis 0
29-12-2011 ---> true
millis 0
31-12-2000 ---> true
millis 0
1-1-2010 ---> false
millis 0
1-1-99 ---> false
millis 0
1-01-99 ---> false
millis 0
01-1-99 ---> false
millis 0

For various formats, modify date seperators reg ex and ordering.