JavaScript Toisostring() Ignores Timezone Offset

javascript toISOString() ignores timezone offset

moment.js is great but sometimes you don't want to pull a large number of dependencies for simple things.

The following works as well:

    var tzoffset = (new Date()).getTimezoneOffset() * 60000; //offset in milliseconds
    var localISOTime = (new Date(Date.now() - tzoffset)).toISOString().slice(0, -1);
    
    console.log(localISOTime)  // => '2015-01-26T06:40:36.181'

Date.toISOString() but local time instead of UTC

There is limited built-in support for formatting date strings with timezones in ECMA-262, there is either implementation dependent toString and toLocaleString methods or toISOString, which is always UTC. It would be good if toISOString allowed a parameter to specify UTC or local offset (where the default is UTC).

Writing your own function to generate an ISO 8601 compliant timestamp with local offset isn't difficult:

function toISOLocal(d) {
  var z  = n =>  ('0' + n).slice(-2);
  var zz = n => ('00' + n).slice(-3);
  var off = d.getTimezoneOffset();
  var sign = off > 0? '-' : '+';
  off = Math.abs(off);

  return d.getFullYear() + '-'
         + z(d.getMonth()+1) + '-' +
         z(d.getDate()) + 'T' +
         z(d.getHours()) + ':'  + 
         z(d.getMinutes()) + ':' +
         z(d.getSeconds()) + '.' +
         zz(d.getMilliseconds()) +
         sign + z(off/60|0) + ':' + z(off%60); 
}

console.log(toISOLocal(new Date()));

How to ISO 8601 format a Date with Timezone Offset in JavaScript?

Here's a simple helper function that will format JS dates for you.

function toIsoString(date) {
  var tzo = -date.getTimezoneOffset(),
      dif = tzo >= 0 ? '+' : '-',
      pad = function(num) {
          return (num < 10 ? '0' : '') + num;
      };

  return date.getFullYear() +
      '-' + pad(date.getMonth() + 1) +
      '-' + pad(date.getDate()) +
      'T' + pad(date.getHours()) +
      ':' + pad(date.getMinutes()) +
      ':' + pad(date.getSeconds()) +
      dif + pad(Math.floor(Math.abs(tzo) / 60)) +
      ':' + pad(Math.abs(tzo) % 60);
}

var dt = new Date();
console.log(toIsoString(dt));

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