Moment

ISO 8601 based time and date module.

Installation

npm install --save @datatypes/moment

Usage

There are classes for every level of precision. These classes are all subclasses of the Moment base class.

import momentFromString, {Moment, Instant, Year, Month, Day,
  Hour, Minute, Second, Millisecond} from '@datatypes/moment'

const year = new Year('2015')
const month = new Month('2015-11')
const day = new Day('2015-11-24')
const hour = new Hour('2015-11-24T21')
const minute = new Minute('2015-11-24T21:32')
// …

// If the precision is not known before instantiation or may vary
const moment = momentFromString('2015-11-24T21:32:45')

// Returns `new Second('2015-11-24T21:32:45')`

Notes

In contrast to the ISO 8601 standard this module assumes that time is specified in UTC per default. This means in order to work with local times they must be explicitly entered with their offset (e.g. 17:45:34+0300) or the relevant flags must be set. (Not yet supported!) This also means that the Z to denote an UTC time is optional.

The Instant class is a simple wrapper for the native Date class in order to be consistent with the ISO 8601 naming schema. It defines an infinitely accurate moment in time.

In accordance with the ISO standard the first day of a week is monday.

Possible formats for the time-string: (when a string can be interpreted as a date or a time, date takes precedence)

1. Date

• Millennium: 2
• Century: 20
• Decade: 201
• Year: 2015, 0002
• Month: 2015-11
• Week:
  • 2015-W48
  • 2015W48
• Day:
  • 2015-11-24
  • 20151124
  • 2015-W48-2
  • 2015W482
  • 2015-328
  • 2015328

1. Time

• Minute:
  • 21:32
  • 2132
• Second:
  • 21:32:43
  • 213243
• Millisecond:
  • 21:32:43.654
  • 213243.654

1. Datetime

• <date>T<time>
• <date> <time>

Properties

Implemented with setters & getters. Therefore some properties are static and some are dynamically created.

const minute = new Minute('2015-11-24T21:37')

console.log(minute.day, minute.month, minute.day, minute.hour, minute.minute)
// 2015 11 24 21 37

console.log(minute.string)
// 2015-11-24T21:37Z

console.log(minute.object)
// { string: '2015-11-24T21:37Z',
//   lowerLimit: new Instant('2015-11-24T21:37:00.000Z'),
//   upperLimit: new Instant('2015-11-24T21:38:00.000Z') }

console.log(minute.lowerLimit.toISOString())
// 2015-11-24T21:37:00.000Z

console.log(minute.upperLimit.toISOString())
// 2015-11-24T21:38:00.000Z

console.log(minute.intervalString)
// Returns an interval string with start and end properties
// from a moment with upperLimit and lowerLimit properties.
//
// 2015-11-24T21:37:00.000Z--2015-11-24T21:38:00.000Z

console.log(minute.duration)
//  new Duration('PT1M0.0S')

Setters for properties are available as native setters and as methods:

const minute = new Minute('2015-11-24T21:37')

minute.minute = 42
minute.setMinute(32)

This allows for easy chaining:

const moment = new Moment()
  .setYear(2015)
  .setMonth(11)
  .setDay(24)
  .setHour(21)
  .setMinute(37)

Methods

toString() or toJSON() (alias for .string)

new Day('2015-11-24').toString() === '2015-11-24'

toObject() (alias for .object)

Returns a plain-object representation of the Moment instance. The lower limit is always inclusive and the upper limit exclusive.

new Millisecond('2015-11-24T21:37:42.123Z').toObject() === {
  string: '2015-11-24T21:37:42.123Z',
  lowerLimit: new Instant('2015-11-24T21:37:42.123Z'),
  upperLimit: new Instant('2015-11-24T21:37:42.124Z'),
  precision: 'millisecond'
}

startOf<unit>()

Mutates a moment by setting it to the start of a unit of time.

const moment = new Millisecond('2115-11-24T18:37:22.345')

moment.startOfYear()   // 2115-01-01T00:00:00.000Z
moment.startOfMonth()  // 2115-11-01T00:00:00.000Z
moment.startOfWeek()   // 2115-11-18T00:00:00.000Z
moment.startOfDay()    // 2115-11-24T00:00:00.000Z
moment.startOfHour()   // 2115-11-24T18:00:00.000Z
moment.startOfMinute() // 2115-11-24T18:37:00.000Z
moment.startOfSecond() // 2115-11-24T18:37:22.000Z

endOf<unit>()

Mutates a moment by setting it to the end of a unit of time.

const moment = new Millisecond('2115-11-24T18:37:22.345')

moment.endOfYear()   // 2115-12-31T23:59:59.999Z
moment.endOfMonth()  // 2115-10-31T23:59:59.999Z
moment.endOfWeek()   // 2115-11-03T23:59:59.999Z
moment.endOfDay()    // 2115-10-29T23:59:59.999Z
moment.endOfHour()   // 2115-10-29T18:59:59.999Z
moment.endOfMinute() // 2115-10-29T18:37:59.999Z
moment.endOfSecond() // 2115-10-29T18:37:22.999Z

maximumOffset(anotherMoment)

isBefore(anotherMoment)

isAfter(anotherMoment)

isSimultaneous(anotherMoment)

clone()