Java Easter Calculator for 2016 using the Gauss algorithm

Question

I am making a Sunday Sunday calculator using the Gauss algorithm over the next 10 years.

It seems to work fine except for a few years. For example, this suggests that in 2016 Easter will be on 2016-03-27, but it will be on 2016-05-01. It works great with other years.

This is my code:

public class EasterCalculator {
public static void main(String[] args) {
    EasterCalculator obj = new EasterCalculator();
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd.MM.yyy");

    for (int i = 2016; i < 2026; i++) {
        System.out.println("Easter  in " + i + " will be on " + obj.getEasterDate(i).format(formatter));
        System.out.println("Trinity in " + i + " will be on " + obj.getEasterDate(i).plusWeeks(7).format(formatter));
        System.out.println();
    }
}

public LocalDate getEasterDate(int year) {
    int a = year % 19;
    int b = year % 4;
    int c = year % 7;
    int k = year / 100;
    int p = (13 + 8 * k) / 25;
    int q = k / 4;
    int M = (15 - p + k - q) % 30;
    int N = (4 + k - q) % 7;
    int d = (19 * a + M) % 30;
    int e = (2 * b + 4 * c + 6 * d + N) % 7;

    if (d == 29 && e == 6) {
        return LocalDate.of(year, 3, 22).plusDays(d + e).minusDays(7);
    } else
        return LocalDate.of(year, 3, 22).plusDays(d + e);
}
}

Answer 1

According to this and this, Easter Sunday is on 2016-03-27. I also tested your code and it seemed to work. I don’t know if I understood your question, but it seems to me that Gauss is still right.

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