Question

Given a datetime string like so:

mystring = '2012-10-23T02:40:59Z'

I need to be able to get the day of the week (0-6) from the string.

How can I pass the above to JS so I can do something like so:

var d = new Date(mystring);
var n = d.getDay();
console.log(n)

where n returns 0-6.

Thank you

Answer 1

While the Date object should be able to parse the ISO 8601 format in ECMA-262, it does not work reliably across browsers so you are much better off to parse them manually:

function isoStringToDate(s) {
  var b = s.split(/\D/);
  return new Date(Date.UTC(b[0], --b[1], b[2], b[3]||0, b[4]||0, b[5]||0, b[6]||0));
}

You can then use the getDay method to get the day number (Sunday = 0, Saturday = 6):

isoStringToDate('2012-10-23T02:40:59Z').getDay(); // 2 for me