PHP's mktime in JavaScript

module.exports = functionmktime () {
//  discuss at: https://locutus.io/php/mktime/
// original by: Kevin van Zonneveld (https://kvz.io)
// improved by: baris ozdil
// improved by: Kevin van Zonneveld (https://kvz.io)
// improved by: FGFEmperor
// improved by: Brett Zamir (https://brett-zamir.me)
//    input by: gabriel paderni
//    input by: Yannoo
//    input by: jakes
//    input by: 3D-GRAF
//    input by: Chris
// bugfixed by: Kevin van Zonneveld (https://kvz.io)
// bugfixed by: Kevin van Zonneveld (https://kvz.io)
// bugfixed by: Marc Palau
// bugfixed by: Brett Zamir (https://brett-zamir.me)
//  revised by: Theriault (https://github.com/Theriault)
//      note 1: The return values of the following examples are
//      note 1: received only if your system's timezone is UTC.
//   example 1: mktime(14, 10, 2, 2, 1, 2008)
//   returns 1: 1201875002
//   example 2: mktime(0, 0, 0, 0, 1, 2008)
//   returns 2: 1196467200
//   example 3: var $make = mktime()
//   example 3: var $td = new Date()
//   example 3: var $real = Math.floor($td.getTime() / 1000)
//   example 3: var $diff = ($real - $make)
//   example 3: $diff < 5
//   returns 3: true
//   example 4: mktime(0, 0, 0, 13, 1, 1997)
//   returns 4: 883612800
//   example 5: mktime(0, 0, 0, 1, 1, 1998)
//   returns 5: 883612800
//   example 6: mktime(0, 0, 0, 1, 1, 98)
//   returns 6: 883612800
//   example 7: mktime(23, 59, 59, 13, 0, 2010)
//   returns 7: 1293839999
//   example 8: mktime(0, 0, -1, 1, 1, 1970)
//   returns 8: -1
const d = newDate()
const r = arguments
let i = 0
const e = ['Hours', 'Minutes', 'Seconds', 'Month', 'Date', 'FullYear']
for (i = 0; i < e.length; i++) {
if (typeof r[i] === 'undefined') {
      r[i] = d['get' + e[i]]()
// +1 to fix JS months.
      r[i] += (i === 3)
    } else {
      r[i] = parseInt(r[i], 10)
if (isNaN(r[i])) {
returnfalse
      }
    }
  }
// Map years 0-69 to 2000-2069 and years 70-100 to 1970-2000.
  r[5] += (r[5] >= 0 ? (r[5] <= 69 ? 2e3 : (r[5] <= 100 ? 1900 : 0)) : 0)
// Set year, month (-1 to fix JS months), and date.
// !This must come before the call to setHours!
  d.setFullYear(r[5], r[3] - 1, r[4])
// Set hours, minutes, and seconds.
  d.setHours(r[0], r[1], r[2])
const time = d.getTime()
// Divide milliseconds by 1000 to return seconds and drop decimal.
// Add 1 second if negative or it'll be off from PHP by 1 second.
return (time / 1e3 >> 0) - (time < 0)
}