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Regular Expression Details

Title Test Find Date
Expression
^(\d{4}(?:(?:(?:\-)?(?:00[1-9]|0[1-9][0-9]|[1-2][0-9][0-9]|3[0-5][0-9]|36[0-6]))?|(?:(?:\-)?(?:1[0-2]|0[1-9]))?|(?:(?:\-)?(?:1[0-2]|0[1-9])(?:\-)?(?:0[1-9]|[12][0-9]|3[01]))?|(?:(?:\-)?W(?:0[1-9]|[1-4][0-9]5[0-3]))?|(?:(?:\-)?W(?:0[1-9]|[1-4][0-9]5[0-3])(?:\-)?[1-7])?)?)$
Description
This is a regular expression to check for a properly formatted date according to the international date and time notation ISO 8601. See ISO 8601 specification for more information.
Matches
ISO 8601 date format
Non-Matches
non-ISO date format
Author Rating: The rating for this expression. Ted Cambron
Source
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Existing User Comments

Title: Leap years and short-long months
Name: Robajz
Date: 8/28/2011 10:39:54 AM
Comment:
Hi, Thanks for the pattern. I have expanded it to support leap years and short-long months here: http://regexlib.com/REDetails.aspx?regexp_id=3344 Regards, Rob


Title: Hmm...
Name: Ted Cambron
Date: 11/16/2008 10:55:14 AM
Comment:
I don't understand what's going on with this. It works using the regex coach but not on the tester here. I wonder what it could be.


Title: Hmm...
Name: Ted Cambron
Date: 11/16/2008 10:55:04 AM
Comment:
I don't understand what's going on with this. It works using the regex coach but not on the tester here. I wonder what it could be.


Title: Hmm...
Name: Ted Cambron
Date: 11/16/2008 10:53:38 AM
Comment:
I don't understand what's going on with this. It works using the regex coach but not on the tester here. I wonder what it could be.


Title: Hmm...
Name: Ted Cambron
Date: 11/16/2008 10:49:57 AM
Comment:
I don't understand what's going on with this. It works using the regex coach but not on the tester here. I wonder what it could be.


Title: Does not work :(
Name: Mike
Date: 10/6/2008 4:06:46 PM
Comment:
Try a few examples from this note: http://www.w3.org/TR/NOTE-datetime Unfortunately most of them are rejected by this REGEX


Title: Doesn't work
Name: Michael Newman
Date: 5/23/2008 3:03:37 PM
Comment:
This doesn't match iso 8601 format


Title: Updated
Name: Ted Cambron
Date: 2/12/2008 10:41:16 PM
Comment:
I updated it so that the day of year is 001 - 366, the week number is 01 - 53, and day of week number is 1 - 7. I also updated the month and day part to restrict it to more realistic numbers.


Title: Can be improved
Name: Ted Cambron
Date: 2/9/2008 8:55:58 PM
Comment:
I just noticed that even though the formatting is to specification it will allow unrealistic dates. Can be improved.


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