How to Generate ISO 8601 Timestamps with Timezone Offset in JavaScript?

ISO 8601 Formatting of Dates with Timezone Offset in JavaScript

Goal: Construct a URL with a timestamp in ISO 8601 format that includes the timezone offset.

Approach:

1. Obtain the local time using new Date().
2. Calculate the timezone offset from UTC using getTimezoneOffset().
3. Construct the timestamp string in the required format: yyyy-MM-ddThh:mm:ss±hh:mm.

Implementation:

The following JavaScript function constructs the ISO 8601 timestamp:

function toIsoString(date) {
  var tzo = -date.getTimezoneOffset(),  // Negative offset means UTC is ahead of local time
      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);
}

For example, if the local time is 2013/07/02 9am and the timezone offset is -7 hours (UTC is 7 hours ahead):

var dt = new Date();
console.log(toIsoString(dt));  // Outputs: "2013-07-02T09:00:00-07:00"

Note that the or - sign indicates whether the local time is ahead of or behind UTC.

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