Qrono - 🕥 Just right date time library

qrono('2021-08-31 12:34').plus({ month: 1 }).isSame(qrono('2021-09-30 12:34'))
qrono('2021-08-31 12:34') < qrono('2021-09-30 12:34')
qrono({ localtime: true }, '2021-08-31 12:34').toString() === '2021-08-31T12:34.000-04:00'

🎨 Design philosophy | 📥 Getting started | 🚀 Quick tour | 🌏 License

Design philosophy 🎨

• Provides immutable and chain-able functions that are necessary in most cases.
• Locality-Agnostic.
  • Localization could be done with ECMAScript® Internationalization API.
• Supports only UTC (as default) and local time of the environment.
  • Other libraries tend to have bigger code base and complicated usage to support multiple time zones and locales.
  • In most cases, it is enough to support only the time zone of the client environment. The Luxon's explanation is right to the point.
• Enables to handle ambiguous time of daylight saving time strictly.
  • This feature can be achieved thanks to the abandonment of support time zones and locales.
• Follows ISO 8601.
• Pure JavaScript without dependencies.

Getting started 📥

Browser

<script src="path/to/qrono.min.js"></script>
<!-- from UNPKG -->
<script src="https://unpkg.com/qrono/dist/qrono.min.js"></script>

Node.js

npm install qrono

// as module
import qrono from 'qrono'
// or CommonJS
const { qrono } = require('qrono')

Quick tour 🚀

Construction

// now
qrono()
// from various type of arguments
qrono('2022-12-31') // => 2022-12-31T00:00:00.000Z
qrono(new Date())
// followings are same 2022-12-31T15:23:11.321Z
qrono('2022-12-31 15:23:11.321')
qrono(1672500191321)
qrono(2022, 12, 31, 15, 23, 11, 321)
qrono([2022, 12, 31, 15, 23, 11, 321])
qrono({ year: 2022, month: 12, day: 31, hour: 15, minute: 23, second: 11, millisecond: 321 })

Accessor

const time = qrono(2022, 12, 31, 15, 23, 11, 321)
time.year()        // => 2022
time.month()       // => 12
time.day()         // => 31
time.hour()        // => 15
time.minute()      // => 23
time.second()      // => 11
time.millisecond() // => 321

time.second(0) // => returns new Qrono instance

Time zone

// UTC as default
qrono('2022-12-31 15:23:11.321').toString() // => "2022-12-31T15:23:11.321Z"
// set default to local time
qrono.asLocaltime()
qrono('2022-12-31 15:23:11.321').toString()     // => "2022-12-31T15:23:11.321-04:00"
qrono('2022-12-31 15:23:11.321').asUtc().hour() // => 11 as UTC
qrono('2022-12-31 15:23:11.321').hour()         // => 15 as local time

Conversion

qrono('2000-01-01').numeric() // => 946,684,800,000 milliseconds from UNIX epoch
  === +qrono('2000-01-01')    // => true
const time = qrono('2000-01-02 03:04:05.006')
time.toObject()   // => { year: 2000, month: 1, day: 2, hour: 3, minute: 4, second: 5, millisecond: 6 }
time.toArray()    // => [2000, 1, 2, 3, 4, 5, 6]
time.nativeDate() // => JavaScript native Date instance

Calculation

qrono('2000-01-01 01:00:00.000') - qrono('2000-01-01') // => 3,600,000 milliseconds = 1 hour
qrono('2000-01-01 01:00:00.000') < qrono('2000-01-01') // => false
qrono('2000-01-01').plus(7200000).minus(3600000)       // => 2000-01-01T01:00:00.000Z
qrono('2000-01-01').minus({ hour: 1, minute: 30 })     // => 1999-12-31T22:30:00.000Z

const today = qrono()
const yesterday = today.minus({ day: 1 })
const tommorrow = today.plus({ day: 1 })
today.isBetween(yesterday, tommorrow) // => true

Short-hands

const time = qrono('2000-01-02 03:04:05.006')
time.startOfYear()   // => 2000-01-01T00:00:00.000Z
time.startOfMonth()  // => 2000-01-01T00:00:00.000Z
time.startOfDay()    // => 2000-01-02T00:00:00.000Z
time.startOfHour()   // => 2000-01-02T03:00:00.000Z
time.startOfMinute() // => 2000-01-02T03:04:00.000Z
time.startOfSecond() // => 2000-01-02T03:04:05.000Z
time.dayOfWeek()     // => 7 === qrono.sunday
time.dayOfYear()     // => 2
time.isLeapYear()    // => true
time.daysInMonth()   // => 31
time.daysInYear()    // => 366
// ISO week number. See https://en.wikipedia.org/wiki/ISO_week_date
time.weeksInYear()   // => 52
time.weekOfYear()    // => 52
time.yearOfWeek()    // => 1999
// Daylight saving time stuff that is meaningful in case of local time
const localtime = time.asLocaltime()
localtime.hasDstInYear()
localtime.isInDst()
localtime.isDstTransitionDay()
localtime.minutesInDay()

QronoDate

qrono.date(...) returns a QronoDate instance with only date information.

Methods of QronoDate are almost compatible with those of Qrono.

qrono.date('2000-01-02').toString()       // => "2000-01-02"
qrono('2000-01-02 23:04:05.006').toDate() // => QronoDate instance 2000-01-02
qrono.date('2000-01-02').numeric()        // => 10958 days from UNIX epoch

License 🌏

MIT

Copyright (c) 2021 Urin