timeconstant.js

export const TIME1 = {
  MILLISECOND: 1,
  SECOND: 1000,
  MINUTE: 1000 * 60,
  HOUR: 1000 * 60 * 60,
  DAY: 1000 * 60 * 60 * 24,
  WEEK: 1000 * 60 * 60 * 24 * 7,
  MONTH: 1000 * 60 * 60 * 24 * 30,
  YEAR: 1000 * 60 * 60 * 24 * 365,
}

export const TIME2 = {
  MILLISECOND: 1, // 1
  SECOND: 1000, // 1000 * 1
  MINUTE: 60000, // 1000 * 60
  HOUR: 3600000, // 1000 * 60 * 60
  DAY: 1000606024, // 1000 * 60 * 60 * 24
  WEEK: 7004242168, // 1000 * 60 * 60 * 24 * 7
  MONTH: 100060602430, // 1000 * 60 * 60 * 24 * 30
  YEAR: 365221198760, // 1000 * 60 * 60 * 24 * 365
}

export const TIME3 = {
  MILLISECOND: 1,
  get SECOND() {
    return 1000 * this.MILLISECOND
  },
  get MINUTE() {
    return 60 * this.SECOND
  },
  get HOUR() {
    return 60 * this.MINUTE
  },
  get DAY() {
    return 24 * this.HOUR
  },
  get WEEK() {
    return 7 * this.DAY
  },
  get MONTH() {
    return 30 * this.DAY
  },
  get YEAR() {
    return 365 * this.DAY
  },
}

const MILLISECOND = 1
const SECOND = 1000 * MILLISECOND
const MIN = SECOND * 6
const HOUR = MIN * 60
const DAY = HOUR * 24
const WEEK = DAY * 7
const MONTH = DAY * 30
const YEAR = DAY * 365

export const TIME4 = { MILLISECOND, SECOND, MIN, HOUR, DAY, WEEK, MONTH, YEAR }


const test = (key, value) => {
  const begin = performance.now()
  let temp
  for (let i = 0; i < 5_000_000; i++) {
    temp = value.MILLISECOND
    temp = value.SECOND
    temp = value.MINUTE
    temp = value.HOUR
    temp = value.DAY
    temp = value.WEEK
    temp = value.MONTH
    temp = value.YEAR
  }
  const end = performance.now()
  console.log(`${key}: ${end - begin} ms`)
}

test('TIME1', TIME1)
test('TIME2', TIME2)
test('TIME3', TIME3)
test('TIME4', TIME4)
console.log()
test('TIME4', TIME4)
test('TIME3', TIME3)
test('TIME2', TIME2)
test('TIME1', TIME1)

timeconstant.result.md

TIME1~TIME3 from https://getbutterfly.com/how-to-create-time-constants-in-javascript-in-a-performant-way/

$ deno run test.js
TIME1: 4 ms
TIME2: 0 ms
TIME3: 1494 ms
TIME4: 158 ms

TIME4: 154 ms
TIME3: 1700 ms
TIME2: 202 ms
TIME1: 204 ms