hijriToCalendars versions performance compare

index.js

const performanceCompare = (callBack1, callBack2, amplifier=1000000) => {
  const t1 = performance.now();
  callBack1();
  const t2 = performance.now();
  const t3 = performance.now();
  callBack2();
  const t4 = performance.now();
  const perform1 = ~~(t2-t1);
  const perform2 = ~~(t4-t3);
  if(perform1 || perform2) {
    return `${callBack1} took ${perform1} milliseconds while ${callBack2} took ${perform2} milliseconds`
  }
  const t5 = performance.now();
  for(let i = 0; i < amplifier; i+=1) {
    callBack1();
  }
  const t6 = performance.now();

  const t7 = performance.now();
  for(let j = 0; j < amplifier; j+=1) {
    callBack2();
  }
  const t8 = performance.now();

  const perform3 = ~~(t5-t6);
  const perform4 = ~~(t8-t7);
  return `iterating ${amplifier} times ${callBack1} took ${perform3} milliseconds while ${callBack2} took ${perform4} milliseconds`
}

function hijriToCalendars(year, month, day, op={}) {
  op.fromCal ??= "islamic-umalqura";   //
  let   gD      = new Date(Date.UTC(2000,0,1));
  gD      = new Date(gD.setUTCDate(gD.getUTCDate() +
    ~~(227022+(year+(month-1)/12+day/354)*354.367)));
  const gY      = gD.getUTCFullYear(gD)-2000,
    dFormat = new Intl.DateTimeFormat('en-u-ca-' + op.fromCal, {dateStyle:'short', timeZone:'UTC'});
  gD      = new Date(( gY < 0 ? "-" : "+")+("00000" + Math.abs(gY)).slice(-6)+"-"+("0" + (gD.getUTCMonth(gD)+1)).slice(-2)+"-" + ("0" + gD.getUTCDate(gD)).slice(-2));
  let [iM,iD,iY]= [...dFormat.format(gD).split("/")], i=0;
  gD      = new Date(gD.setUTCDate(gD.getUTCDate() +
    ~~(year*354+month*29.53+day-(iY.split(" ")[0]*354+iM*29.53+iD*1)-2)));
  while (i < 4) {
    [iM,iD,iY] = [...dFormat.format(gD).split("/")];
    if (iD == day && iM == month && iY.split(" ")[0] == year) return formatOutput(gD);
    gD = new Date(gD.setUTCDate(gD.getUTCDate()+1)); i++;
  }
  throw new Error("Invalid "+op.fromCal+" date!");
  function formatOutput(gD){
    return "toCal"in op ? (op.calendar= op.toCal,
      new Intl.DateTimeFormat(op.locale ??= "en", op).format(gD)) : gD;
  }
}

function hijriToCalendarsv2(year, month, day, op={}) {
  const { fromCal ="islamic-umalqura", toCal=null, locale="en" } = op;
  let gD = new Date(Date.UTC(2000, 0, 1))
  gD.setUTCDate(gD.getUTCDate() + ~~(227022+(year+(month-1)/12+day/354)*354.367));
  const dFormat = new Intl.DateTimeFormat(`en-u-ca-${fromCal}`, { dateStyle:'short', timeZone:'UTC' });
  const gY = gD.getUTCFullYear()-2000;
  gD = new Date(`${gY < 0 ? "-" : "+"}${`00000${Math.abs(gY)}`.slice(-6)}-${`0${gD.getUTCMonth()+1}`.slice(-2)}-${`0${gD.getUTCDate()}`.slice(-2)}`);
  let [iM, iD, iY] = dFormat.format(gD).split("/");
  gD.setUTCDate(gD.getUTCDate() + ~~(year*354+month*29.53+day-(iY.split(" ")[0]*354+iM*29.53+iD*1)-2));
  const formatOutput = (_gD) => {
    return toCal ? new Intl.DateTimeFormat(locale, op).format(_gD) : _gD;
  }
  for (let i=0; i < 4; i+=1) {
    [iM, iD, iY] = dFormat.format(gD).split("/");
    if (~~iD === ~~day && ~~iM === ~~month && ~~iY.split(" ")[0] === ~~year) return formatOutput(gD);
    gD.setUTCDate(gD.getUTCDate()+1);
  }
  throw new Error(`Invalid ${fromCal} date!`);
}

const check = performanceCompare(() => hijriToCalendars(8443,9,1,{}), () => hijriToCalendarsv2(8443,9,1,{}))


console.warn(`check ${check}`);