Convert yyyy-MM-ddTHH:mm:ss.fffZ to DateTime in JavaScript manually

Question

I receive from a Webservice a String with a date in this format:

yyyy-MM-ddTHH:mm:ss.fffZ

I need to convert that String with JavaScript to

Answer 1

If you know it will be of this form (ISO 8601, wiki), you can parse with RegExp or string methods. Here is a RegExp example that lets you use timezone Z, +hh or +hh:mm.

var dateString = '2013-01-08T17:16:36.000Z';

var ISO_8601_re = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{3}))?(Z|[\+-]\d{2}(?::\d{2})?)$/,
    m = dateString .match(ISO_8601_re);

var year = +m[1],
    month = +m[2],
    dayOfMonth = +m[3],
    hour = +m[4],
    minute = +m[5],
    second = +m[6],
    ms = +m[7], // +'' === 0
    timezone = m[8];

if (timezone === 'Z') timezone = 0;
else timezone = timezone.split(':'), timezone = +(timezone[0][0]+'1') * (60*(+timezone[0].slice(1)) + (+timezone[1] || 0));
// timezone is now minutes

// your prefered way to construct
var myDate = new Date();
myDate.setUTCFullYear(year);
myDate.setUTCMonth(month - 1);
myDate.setUTCDate(dayOfMonth);
myDate.setUTCHours(hour);
myDate.setUTCMinutes(minute + timezone); // timezone offset set here, after hours
myDate.setUTCSeconds(second);
myDate.setUTCMilliseconds(ms);

console.log(myDate); // Tue Jan 08 2013 17:16:36 GMT+0000 (GMT Standard Time)