GAS: Hijriah

Pembuatan script Gregorian to Hijriah di google apps script (GAS) tidak jauh beda dengan script yg ditulis di javascript, bahkan tinggal copy paste. Contoh script dibawah untuk konversi tanggal ke hijriah.

sumber :https://stackoverflow.com/questions/19462916/how-to-make-gregorian-and-islamic-calendar-in-one-javascript

// Returns mathematic mod, not javascript mod
// e.g. gmod(-3, 2) returns 1, whereas -3%2 returns -1
function gmod(n, m){
  return ((n % m) + m) % m;
}

/* @param {Date}   date   - optional, default is today
** @param {number} adjust - optiona, days to adjust date by
*/
function kuwaiticalendar(date, adjust) {
  var today = date? new Date(+date) : new Date();
  if (adjust) {
    today.setDate(today.getDate() + +adjust);
  }

  var day = today.getDate();
  var month = today.getMonth();
  var year = today.getFullYear();
  var m = month + 1;
  var y = year;

  if (m < 3) {
      y -= 1;
      m += 12;
  }

  var a = Math.floor(y / 100);
  var b = 2 - a + Math.floor(a / 4);

  if (y < 1583) b = 0;
  if (y == 1582) {
    if (m > 10)  b = -10;
    if (m == 10) {
      b = 0;
      if (day > 4) b = -10;
    }
  }

  var jd = Math.floor(365.25*(y+4716))+Math.floor(30.6001*(m+1))+day+b-1524;

  b = 0;
  if(jd > 2299160){
    a = Math.floor((jd - 1867216.25) / 36524.25);
    b = 1+a-Math.floor(a / 4);
  }

  var bb = jd+b+1524;
  var cc = Math.floor((bb - 122.1) / 365.25);
  var dd = Math.floor(365.25 * cc);
  var ee = Math.floor((bb - dd) / 30.6001);
  day = (bb - dd) - Math.floor(30.6001 * ee);
  month = ee - 1;

  if (ee > 13) {
    cc += 1;
    month = ee - 13;
  }
  year = cc - 4716;
  var wd = gmod(jd + 1, 7) + 1;

  var iyear = 10631./30.;
  var epochastro = 1948084;
  var epochcivil = 1948085;

  var shift1 = 8.01 / 60.;

  var z = jd-epochastro;
  var cyc = Math.floor(z/10631.);
  z = z - 10631 * cyc;
  var j = Math.floor((z - shift1) / iyear);
  var iy = 30 * cyc + j;
  z = z - Math.floor(j * iyear + shift1);
  var im = Math.floor((z + 28.5001) / 29.5);

  if (im == 13) im = 12;
  var id = z-Math.floor(29.5001*im-29);

  return [
    day,       //calculated day (CE)
    month - 1, //calculated month (CE)
    year,      //calculated year (CE)
    jd - 1,    //julian day number
    wd - 1,    //weekday number
    id,        //islamic date
    im - 1,    //islamic month
    iy         //islamic year
  ];
}

function writeIslamicDate(date, adjustment) {
  var wdNames = ["Ahad", "Ithnin", "Thulatha", "Arbaa", "Khams", "Jumuah", "Sabt"];
  var iMonthNames = ["Muharram", "Safar", "Rabi'ul Awwal", "Rabi'ul Akhir", "Jumadal Ula", "Jumadal Akhira",
                     "Rajab", "Sha'ban", "Ramadan", "Shawwal", "Dhul Qa'ada", "Dhul Hijja"];
  var iDate = kuwaiticalendar(date, adjustment);
  var outputIslamicDate = wdNames[iDate[4]] + ", " + iDate[5] + " " +
                          iMonthNames[iDate[6]] + " " + iDate[7] + " AH";
  return outputIslamicDate;
}

Catatan Google Apps Script Februari 26, 2019