ISO-8601 UTC datetimes in web-applications

The best way to handle dates in web-apps (especially a backend side) is using ISO-8601 standart (DB dates, input params, responses).

An example of an ISO-8601 UTC datetime: ‘2019-03-02T13:27:40Z’.

Usage:

• npm install moment –save or npm install moment-timezone –save:

const moment = require('moment-timezone');

• get a Moment (UTC mode) by a current system time:

moment.utc();

• print a current system time (my system time is GMT+5):

moment().format();
// > '2019-03-02T18:27:40+05:00'

• print a current system UTC time (my system time is GMT+5)

moment.utc().format();
// > '2019-03-02T13:27:40Z'

• get a Moment (UTC mode) by a UTC date (string)

const utcDateString = '2019-03-02T13:27:40Z';
moment.utc(utcDateString);

• get a JS Date by a UTC date (string)

moment.utc(utcDateString).toDate();

• check is a valid ISO 8601 date (string)

const isValidDate = moment(utcDateString, moment.ISO_8601).isValid();

• convert a UTC date (string) to a Moment with changed timeozne
  1. get a JS Date by a UTC date (string)
  2. change the timezone to ‘America/Los_Angeles’

moment.utc(utcDateString).tz('America/Los_Angeles');

• convert a timezone date (string) to a Moment (with a timezone offset)
  1. get a Moment by a date (string) and a timezone
  2. get a Moment (UTC mode)

const losAngelesDate = 'March 2nd 2019, 5:27:40 am';
moment.tz(losAngelesDate, 'MMMM Do YYYY, h:mm:ss a', 'America/Los_Angeles').utc();
// > 2019-03-02T13:27:40Z