The Meeus/Jones/Butcher Gregorian algorithm is used for calculating the Easter Sunday of any given year using C#.
1. // Finds the Easter Sunday of the passed year
2. public static DateTime EasterSundayOf(int YearToCheck)
3. {
4. int Y = YearToCheck;
5. int a = Y % 19;
6. int b = Y / 100;
7. int c = Y % 100;
8. int d = b / 4;
9. int e = b % 4;
10. int f = (b + 8) / 25;
11. int g = (b - f + 1) / 3;
12. int h = (19 * a + b - d - g + 15) % 30;
13. int i = c / 4;
14. int k = c % 4;
15. int L = (32 + 2 * e + 2 * i - h - k) % 7;
16. int m = (a + 11 * h + 22 * L) / 451;
17. int Month = (h + L - 7 * m + 114) / 31;
18. int Day = ((h + L - 7 * m + 114) % 31) + 1;
19. DateTime dtEasterSunday = new DateTime(YearToCheck, Month, Day);
20. return dtEasterSunday;
21.}
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