Calculate the date of Easter Sunday

Question

Write a program to compute the date of Easter Sunday. Easter Sunday is the first Sunday after the first full moon of spring. Use the algorithm invented by the mathematician

Answer 1

/**
 * Orthodox easter formula, invented back in 1800 by famous Carl Friedrich Gauss.
 */
public static LocalDate getEasterSundayDate(int year) {
    int a = year % 19,
            b = year / 100,
            c = year % 100,
            d = b / 4,
            e = b % 4,
            g = (8 * b + 13) / 25,
            h = (19 * a + b - d - g + 15) % 30,
            j = c / 4,
            k = c % 4,
            m = (a + 11 * h) / 319,
            r = (2 * e + 2 * j - k - h + m + 32) % 7,
            month = (h - m + r + 90) / 25,
            day = (h - m + r + month + 19) % 32;

    return LocalDate.of( year, month, day );
}