Easiest way to convert month name to month number in JS ? (Jan = 01)

Question

Just want to covert Jan to 01 (date format)

I can use array() but looking for another way...

Any suggestion?

Answer 1

Just for fun I did this:

function getMonthFromString(mon){
   return new Date(Date.parse(mon +" 1, 2012")).getMonth()+1
}

Bonus: it also supports full month names :-D Or the new improved version that simply returns -1 - change it to throw the exception if you want (instead of returning -1):

function getMonthFromString(mon){

   var d = Date.parse(mon + "1, 2012");
   if(!isNaN(d)){
      return new Date(d).getMonth() + 1;
   }
   return -1;
 }

Sry for all the edits - getting ahead of myself

Answer 2

If you are using moment.js:

moment().month("Jan").format("M");

Answer 3

Here is a modified version of the chosen answer:

getMonth("Feb")
function getMonth(month) {
  d = new Date().toString().split(" ")
  d[1] = month
  d = new Date(d.join(' ')).getMonth()+1
  if(!isNaN(d)) {
    return d
  }
  return -1;
}

Answer 4

If you don't want an array then how about an object?

var months = {
    'Jan' : '01',
    'Feb' : '02',
    'Mar' : '03',
    'Apr' : '04',
    'May' : '05',
    'Jun' : '06',
    'Jul' : '07',
    'Aug' : '08',
    'Sep' : '09',
    'Oct' : '10',
    'Nov' : '11',
    'Dec' : '12'
}

Answer 5

One more way to do the same

month1 = month1.toLowerCase();
var months = ["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"];
month1 = months.indexOf(month1);