Temporal.Now

Table of Contents

The Temporal.Now object has several methods which give information about the current time and date.

Methods

Temporal.Now.zonedDateTimeISO(timeZone: object | string = Temporal.Now.timeZone()) : Temporal.ZonedDateTime

Parameters:

Returns: a Temporal.ZonedDateTime object representing the current system date, time, time zone, and time zone offset.

This method gets the current date, time, time zone, and time zone offset according to the system settings, in the reckoning of the ISO 8601 calendar system. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

This method is the same as zonedDateTime(), but always uses the ISO 8601 calendar.

Example usage:

financialCentres = {
  'New York': 'America/New_York',
  London: 'Europe/London',
  Tokyo: 'Asia/Tokyo'
};
console.log(`Here: ${Temporal.Now.zonedDateTimeISO()}`);
Object.entries(financialCentres).forEach(([name, timeZone]) => {
  console.log(`${name}: ${Temporal.Now.zonedDateTimeISO(timeZone)}`);
});
// example output:
// Here: 2020-09-18T01:17:48.431957915-07:00[America/Los_Angeles]
// New York: 2020-09-18T04:17:48.435068431-04:00[America/New_York]
// London: 2020-09-18T09:17:48.438068435+01:00[Europe/London]
// Tokyo: 2020-09-18T17:17:48.441068438+09:00[Asia/Tokyo]

Temporal.Now.zonedDateTime(calendar: object | string, timeZone: object | string = Temporal.Now.timeZone()) : Temporal.ZonedDateTime

Parameters:

Returns: a Temporal.ZonedDateTime object representing the current system date, time, time zone, and time zone offset.

This method gets the current date, time, time zone, and time zone offset according to the system settings, in the reckoning of the given calendar system. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

If you only want to use the ISO 8601 calendar, use Temporal.Now.zonedDateTimeISO().

Temporal.Now.instant() : Temporal.Instant

Returns: a Temporal.Instant object representing the current system time.

This method gets the current exact system time, without regard to calendar or time zone. This is a good way to get a timestamp for an event, for example. It works like the old-style JavaScript Date.now(), but with nanosecond accuracy instead of milliseconds.

Example usage:

function timeit(func) {
  start = Temporal.Now.instant();
  try {
    return func();
  } finally {
    end = Temporal.Now.instant();
    console.log(`The function took ${end.since(start)}`);
  }
}
timeit(() => JSON.parse(someData));
// example output:
// The function took PT0.001031756S

Temporal.Now.timeZone() : Temporal.TimeZone

Returns: a Temporal.TimeZone object representing the time zone according to the current system settings.

This method gets the current system time zone. This will usually be a named IANA time zone, as that is how most people configure their computers.

Example usage:

// When is the next daylight saving change from now, in the current location?
tz = Temporal.Now.timeZone();
now = Temporal.Now.instant();
nextTransition = tz.getNextTransition(now);
before = tz.getOffsetStringFor(nextTransition.subtract({ nanoseconds: 1 }));
after = tz.getOffsetStringFor(nextTransition.add({ nanoseconds: 1 }));
console.log(`At ${nextTransition.toZonedDateTimeISO(tz)} the offset will change from UTC ${before} to ${after}`);
// example output:
// At 2021-03-14T03:00:00-07:00[America/Los_Angeles] the offset will change from UTC -08:00 to -07:00

Temporal.Now.plainDateTimeISO(timeZone: object | string = Temporal.Now.timeZone()) : Temporal.PlainDateTime

Parameters:

Returns: a Temporal.PlainDateTime object representing the current system date and time in the reckoning of the ISO 8601 calendar.

This method gets the current calendar date and wall-clock time according to the system settings. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

This method is the same as dateTime(), but always uses the ISO 8601 calendar.

Example usage:

financialCentres = {
  'New York': 'America/New_York',
  'London': 'Europe/London',
  'Tokyo': 'Asia/Tokyo',
};
console.log(`Here: ${Temporal.Now.plainDateTimeISO()}`);
Object.entries(financialCentres).forEach(([name, timeZone]) => {
  console.log(`${name}: ${Temporal.Now.plainDateTimeISO(timeZone)}`);
});
// example output:
// Here: 2020-01-24T21:51:02.142905166
// New York: 2020-01-25T00:52:14.756462142
// London: 2020-01-25T05:52:14.758534756
// Tokyo: 2020-01-25T14:52:14.759534758

Temporal.Now.plainDateTime(calendar: object | string, timeZone: object | string = Temporal.Now.timeZone()) : Temporal.PlainDateTime

Parameters:

Returns: a Temporal.PlainDateTime object representing the current system date and time in the reckoning of the given calendar system.

This method gets the current calendar date and wall-clock time according to the system settings. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

If you only want to use the ISO 8601 calendar, use Temporal.Now.plainDateTimeISO().

Temporal.Now.plainDateISO(timeZone: object | string = Temporal.Now.timeZone()) : Temporal.PlainDate

Parameters:

Returns: a Temporal.PlainDate object representing the current system date in the reckoning of the ISO 8601 calendar.

This method gets the current calendar date according to the system settings. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

This method is the same as date(), but always uses the ISO 8601 calendar.

Example usage:

// Is it New Year in the ISO 8601 calendar?
date = Temporal.Now.plainDateISO();
if (date.month === 1 && date.day === 1) console.log('New year!');

Temporal.Now.plainDate(calendar: object | string, timeZone: object | string = Temporal.Now.timeZone()) : Temporal.PlainDate

Parameters:

Returns: a Temporal.PlainDate object representing the current system date in the reckoning of the given calendar.

This method gets the current calendar date according to the system settings. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

If you only want to use the ISO 8601 calendar, use Temporal.Now.plainDateISO().

// Is it Nowruz (New Year in the Persian calendar)?
date = Temporal.Now.plainDate('persian');
if (date.month === 1 && date.day === 1) console.log('New year!');

Temporal.Now.plainTimeISO(timeZone: object | string = Temporal.Now.timeZone()) : Temporal.PlainTime

Parameters:

Returns: a Temporal.PlainTime object representing the current system time in the reckoning of the ISO 8601 calendar.

This method gets the current wall-clock time according to the system settings. Optionally a time zone can be given in which the time is computed, instead of the current system time zone.

Example usage:

// Is it lunchtime?
time = Temporal.Now.plainTimeISO();
if (time.hour === 12) console.log('Lunchtime!');