moment js date library, formatting on IE gives a NaN

Question

im using moment js date library to format a date, but on IE i get a NaN on the output. It works fine on other browsers, like Chrome, FF, etc.

var value = "2015-11";

moment(value).format("YYYY-DD-01 00:00")    
> "0NaN-NaN-01 00:00"   

I was able to fix it by adding the same pattern on moment constructor like below:

> moment(value,"YYYY-DD-01 00:00").format("YYYY-DD-01 00:00")   
"2015-11-01 00:00"  

Is it a good practice to add this pattern on the constructor, for all moment objects creation so it can work also on IE?

Answer 1

The input format should match what you are providing:

var value = "2015-11";
moment(value, "YYYY-MM")

If you want to format it differently for output, that's when you use the .format method.

var value = "2015-11";
var m = moment(value, "YYYY-MM")
var s = m.format("YYYY-MM-DD HH:MM")

Note that you were specifying DD which is the day formatter. But based on the usage, I think you meant MM for month.