javascript - What is wrong with getMonth() + 1; - Stack Overflow

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I have this code in Sharepoint:

     var d = $.trim(oListItem.get_item('Begindatum'));
     alert(d);
     var m = d.getMonth() + 1;
     alert(m);

The first alert returns: Thu Apr 20 2017 00:00:00 GMT+0200 (W. Europe Daylight Time), which is correct.

The second alert (m) is not fired and the code after that is not executed. What is wrong with my code?

I have this code in Sharepoint:

     var d = $.trim(oListItem.get_item('Begindatum'));
     alert(d);
     var m = d.getMonth() + 1;
     alert(m);

The first alert returns: Thu Apr 20 2017 00:00:00 GMT+0200 (W. Europe Daylight Time), which is correct.

The second alert (m) is not fired and the code after that is not executed. What is wrong with my code?

• javascript
• date

Share Improve this question Follow asked Jun 2, 2017 at 9:25 johannesjohannes 1,44811 gold badge1313 silver badges2626 bronze badges 6

• Look into the browser console if you see any error – Jens Commented Jun 2, 2017 at 9:27
• 1 Your d is a string, not a Date object. – georg Commented Jun 2, 2017 at 9:27
• 1 $.trim() returns a string – Andreas Commented Jun 2, 2017 at 9:27
• 1 I guess d is a string not a date – Jens Commented Jun 2, 2017 at 9:28
• If you trim something, then it is probably a string value, and not a Date object. Ergo, you can not call Date object methods like getMonth on it. Pretty sure the browser console would’ve already told you something like that, if only you had bothered to look. – C3roe Commented Jun 2, 2017 at 9:28

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1 Answer 1

Sorted by: Reset to default 3

$.trim() will return a string, not a date.

You would need to cast back to a date object before you can do getMonth().

 var d = $.trim(oListItem.get_item('Begindatum'));
 alert(d);
 var m = new Date(d).getMonth() + 1;
 alert(m);

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