PHP's idate in JavaScript

How to use

You you can install via yarn add locutus and require this function via const idate = require('locutus/php/datetime/idate').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#	code	expected result
1	idate('y', 1255633200)	9

Here’s what our current JavaScript equivalent to PHP's idate looks like.

module.exports = function idate(format, timestamp) {
  //  discuss at: https://locutus.io/php/idate/
  // original by: Brett Zamir (https://brett-zamir.me)
  // original by: date
  // original by: gettimeofday
  //    input by: Alex
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  // improved by: Theriault (https://github.com/Theriault)
  //   example 1: idate('y', 1255633200)
  //   returns 1: 9

  if (format === undefined) {
    throw new Error('idate() expects at least 1 parameter, 0 given')
  }
  if (!format.length || format.length > 1) {
    throw new Error('idate format is one char')
  }

  // @todo: Need to allow date_default_timezone_set() (check for $locutus.default_timezone and use)
  const _date =
    typeof timestamp === 'undefined'
      ? new Date()
      : timestamp instanceof Date
        ? new Date(timestamp)
        : new Date(timestamp * 1000)
  let a

  switch (format) {
    case 'B':
      return (
        Math.floor((_date.getUTCHours() * 36e2 + _date.getUTCMinutes() * 60 + _date.getUTCSeconds() + 36e2) / 86.4) %
        1e3
      )
    case 'd':
      return _date.getDate()
    case 'h':
      return _date.getHours() % 12 || 12
    case 'H':
      return _date.getHours()
    case 'i':
      return _date.getMinutes()
    case 'I':
      // capital 'i'
      // Logic original by getimeofday().
      // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
      // If they are not equal, then DST is observed.
      a = _date.getFullYear()
      return 0 + (new Date(a, 0) - Date.UTC(a, 0) !== new Date(a, 6) - Date.UTC(a, 6))
    case 'L':
      a = _date.getFullYear()
      return !(a & 3) && (a % 1e2 || !(a % 4e2)) ? 1 : 0
    case 'm':
      return _date.getMonth() + 1
    case 's':
      return _date.getSeconds()
    case 't':
      return new Date(_date.getFullYear(), _date.getMonth() + 1, 0).getDate()
    case 'U':
      return Math.round(_date.getTime() / 1000)
    case 'w':
      return _date.getDay()
    case 'W':
      a = new Date(_date.getFullYear(), _date.getMonth(), _date.getDate() - (_date.getDay() || 7) + 3)
      return 1 + Math.round((a - new Date(a.getFullYear(), 0, 4)) / 864e5 / 7)
    case 'y':
      return parseInt((_date.getFullYear() + '').slice(2), 10) // This function returns an integer, unlike _date()
    case 'Y':
      return _date.getFullYear()
    case 'z':
      return Math.floor((_date - new Date(_date.getFullYear(), 0, 1)) / 864e5)
    case 'Z':
      return -_date.getTimezoneOffset() * 60
    default:
      throw new Error('Unrecognized _date format token')
  }
}

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

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