converting gregorian to hijri date

Question

I want to convert from Gregorian to Hijri(Islamic) date and I need a java class for this converting. I want to give it an Gregorian date in format of \"yyyy/mm/dd\" as strin

Answer 1

just use Google for example here copied from the link given:

import java.util.Calendar;  
/** 
 * Gregorian-Hijri Dates Converter 
 *  
 *  
 * This Code is used to convert Gregorian dates to Hijri Dates  
 *  
 * 
 */  

public class DateHigri {  


static double gmod(double n,double  m) {  
    return ((n % m) + m) % m;  
}  

static double[] kuwaiticalendar(boolean adjust) {  
    Calendar today = Calendar.getInstance();  
    int adj=0;  
    if(adjust){  
        adj=0;  
    }else{  
        adj=1;  
    }  

    if (adjust) {  
        int adjustmili = 1000 * 60 * 60 * 24 * adj;  
        long todaymili = today.getTimeInMillis() + adjustmili;  
        today.setTimeInMillis(todaymili);  
    }  
    double day = today.get(Calendar.DAY_OF_MONTH);  
    double  month = today.get(Calendar.MONTH);  
    double  year = today.get(Calendar.YEAR);  

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

    double a = Math.floor(y / 100.);  
    double 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;  
        }  
    }  

    double 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.);  
    }  
    double bb = jd + b + 1524;  
    double cc = Math.floor((bb - 122.1) / 365.25);  
    double dd = Math.floor(365.25 * cc);  
    double 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;  

    double wd = gmod(jd + 1, 7) + 1;  

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

    double shift1 = 8.01 / 60.;  

    double z = jd - epochastro;  
    double cyc = Math.floor(z / 10631.);  
    z = z - 10631 * cyc;  
    double j = Math.floor((z - shift1) / iyear);  
    double iy = 30 * cyc + j;  
    z = z - Math.floor(j * iyear + shift1);  
    double im = Math.floor((z + 28.5001) / 29.5);  
    if (im == 13)  
        im = 12;  
    double id = z - Math.floor(29.5001 * im - 29);  

    double[]  myRes = new double[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;  
}  
static String writeIslamicDate() {  
    String[] wdNames = {"Ahad", "Ithnin", "Thulatha", "Arbaa", "Khams",  
            "Jumuah", "Sabt"};  
    String[] iMonthNames = {"Muharram", "Safar", "Rabi'ul Awwal",  
            "Rabi'ul Akhir", "Jumadal Ula", "Jumadal Akhira", "Rajab",  
            "Sha'ban", "Ramadan", "Shawwal", "Dhul Qa'ada", "Dhul Hijja"};  
    // This Value is used to give the correct day +- 1 day  
    boolean dayTest=true;  
    double[] iDate = kuwaiticalendar(dayTest);  
    String outputIslamicDate = wdNames[(int) iDate[4]] + ", " + iDate[5] + " "  
            + iMonthNames[(int) iDate[6]] + " " + iDate[7] + " AH";  

    return outputIslamicDate;  
}  
}