converting gregorian to hijri date

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Firstly, separate out the conversion part from the formatting/parsing part. You can deal with those easily later – and there are lots of questions on Stack Overflow about that.

Personally I’d use Joda Time, which typically makes life much simpler. For example:

import org.joda.time.Chronology;
import org.joda.time.LocalDate;
import org.joda.time.chrono.IslamicChronology;
import org.joda.time.chrono.ISOChronology;

public class Test {
    public static void main(String[] args) throws Exception {
        Chronology iso = ISOChronology.getInstanceUTC();
        Chronology hijri = IslamicChronology.getInstanceUTC();

        LocalDate todayIso = new LocalDate(2013, 3, 31, iso);
        LocalDate todayHijri = new LocalDate(todayIso.toDateTimeAtStartOfDay(),
                                             hijri);
        System.out.println(todayHijri); // 1434-05-19
    }
}

(It feels like there should be a cleaner way of converting dates between chronologies, but I couldn’t find one immediately.)

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