CODEWITHSUNDEEP
javascriptregexstringdatetimedate
TIMEX
TIMEX

Reputation: 271724

How do I determine if a string is date format?

I have some strings like this: 2012-02-05T07:42:47.000Z mixed with other strings. It is always in this format. (but the numbers are not the same, of course...the times are different) (not Sun, 05 Feb 2012 07:42:47 GMT)

I want to know whether a string matches that format. How can I determine that? It's so complicated with the colons and dots and stuff.

Upvotes: 0

Views: 1499

Answers (6)

brandonscript
brandonscript

Reputation: 72865

For what it's worth, you could use moment.js to do this.

var check1 = "2012-02-05T07:42:47.000Z";
alert(moment(check1));
//Sat Feb 04 2012 23:42:47 GMT-0800

var check2 = "201-02-05T07:42:47.000Z";
alert(moment(check2));
//Invalid date

Play around with it here: http://jsfiddle.net/remus/KFjZF/

Upvotes: 0

Bill
Bill

Reputation: 187

Replace all numbers with a # sign so that "2012-02-05T07:42:47.000Z" looks like "####-##-##T##:##:##.###Z" then you can do a direct string search.

I used this technique to find social security numbers within a large block of document text, I converted all numbers to # signs I just needed to look for strings that were ###-##-####

Upvotes: 0

Daniel Gruszczyk
Daniel Gruszczyk

Reputation: 5612

You can use Date.parse( your_string ) and check the result. This will check any allowed date format, unlike regex. http://www.w3schools.com/jsref/jsref_parse.asp

Just realized your string is always in a given format, still unlike regex that function will check if day/month/year are correct etc. So maybe carry 2 checks: 1st to check string format, 2nd to check if numbers are right.

Upvotes: 0

Lalit Kapoor
Lalit Kapoor

Reputation: 400

Try matching with the following regular expression:

var pattern = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z/;
var d = "2012-02-05T07:42:47.000Z";
if(d.match(pattern) !== null){
    //success
} else {
    //failed
}

Upvotes: 0

user1046334
user1046334

Reputation:

The ones for which !isNaN(+new Date(s))?

Upvotes: 0

Navneeth G
Navneeth G

Reputation: 7305

Regex [0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{3}Z

Upvotes: 2

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