javascript - Moment.js issue format method is not working Correctly - Stack Overflow

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var a = moment("24 12 1995").format('DD MM YYYY');
alert(a)

// This should be valid but its not.

var a = moment("12 24 1995").format('DD MM YYYY');
alert(a) 

// This should be Invalid, but its valid. (Month is 24)

Version : Moment.js 2.10.3

var a = moment("24 12 1995").format('DD MM YYYY');
alert(a)

// This should be valid but its not.

var a = moment("12 24 1995").format('DD MM YYYY');
alert(a) 

// This should be Invalid, but its valid. (Month is 24)

Version : Moment.js 2.10.3

• javascript
• momentjs

Share Follow asked Jun 24, 2015 at 6:58 SubscriberSubscriber 4111 gold badge11 silver badge33 bronze badges 3

• 24 months? Which planet are you on? Check formats momentjs./docs/#/displaying/format – Swaraj Giri Commented Jun 24, 2015 at 7:00
• I deliberately write '24' to check if it gets Invalid. but its valid. – Subscriber Commented Jun 24, 2015 at 7:06
• 1 you will need to specify the input format as 2nd param. moment('24 12 1995','DD MM YYYY') – Swaraj Giri Commented Jun 24, 2015 at 7:18

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3 Answers 3

Sorted by: Reset to default 5

You should pass the format as an argument:

moment("24 12 1995", "DD MM YYYY");

What .format function does is formatting the output.

So you can do:

var format = "DD MM YYYY";
var date = moment("24 12 1995", format);
alert(date.format(format));

You could use the second parameter

moment("24 12 1995","DD MM YYYY");

to specify the format of the input string.

Then you can format it any way you want :

moment("24 12 1995","DD MM YYYY").format('MM DD YYYY')
moment("24 12 1995","DD MM YYYY").format('DD MM YYYY')
moment("24 12 1995","DD MM YYYY").format('ddd M YYYY')

When you write

moment("24 12 1995").format('DD MM YYYY');

You're parsing "24 12 1995" using moment's default format options, then taking the created moment object, and outputting it in the 'DD MM YYYY' format, effectively making your a variable a string.

What you want instead is the string+format constructor of moment, which you use like this:

 moment("12-25-1995", "MM-DD-YYYY");

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