CRM 2011 Gregorian to Hijri conversion

CRM 2011 Gregorian to Hijri conversion Javascript

function gmod(n, m) {

    return ((n % m) + m) % m;

}

function kuwaiticalendar(adjust) {

    //var today = new Date();

    var today = Xrm.Page.getAttribute("inf_g2hdate").getValue();

    if (adjust) {

        adjustmili = 1000 * 60 * 60 * 24 * adjust;

        todaymili = today.getTime() + adjustmili;

        today = new Date(todaymili);

    }

    day = today.getDate();

    month = today.getMonth();

    year = today.getFullYear();

    m = month + 1;

    y = year;

    if (m < 3) {

        y -= 1;

        m += 12;

    }

    a = Math.floor(y / 100.);

    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;

        }

    }

    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.);

    }

    bb = jd + b + 1524;

    cc = Math.floor((bb - 122.1) / 365.25);

    dd = Math.floor(365.25 * cc);

    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;

    wd = gmod(jd + 1, 7) + 1;

    iyear = 10631. / 30.;

    epochastro = 1948084;

    epochcivil = 1948085;

    shift1 = 8.01 / 60.;

    z = jd - epochastro;

    cyc = Math.floor(z / 10631.);

    z = z - 10631 * cyc;

    j = Math.floor((z - shift1) / iyear);

    iy = 30 * cyc + j;

    z = z - Math.floor(j * iyear + shift1);

    im = Math.floor((z + 28.5001) / 29.5);

    if (im == 13) im = 12;

    id = z - Math.floor(29.5001 * im - 29);

    var myRes = new Array(8);

    myRes[0] = day; //calculated day (CE)

    myRes[1] = month - 1; //calculated month (CE)

    myRes[2] = year; //calculated year (CE)

    myRes[3] = jd - 1; //julian day number

    myRes[4] = wd - 1; //weekday number

    myRes[5] = id; //islamic date

    myRes[6] = im - 1; //islamic month

    myRes[7] = iy; //islamic year

    return myRes;

}

function writeIslamicDate(adjustment) {

    var iMonthNames = new Array(1,2,3,4,5,6,7,8,9,10,11,12);

    var iDate = kuwaiticalendar(adjustment);

    var outputIslamicDate = iDate[5] + "/" + iMonthNames[iDate[6]] + "/" + iDate[7];

    //alert(outputIslamicDate);

    Xrm.Page.getAttribute("Field Name").setValue(outputIslamicDate);

    return outputIslamicDate;

}