Created
March 22, 2016 09:47
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Calculate easter day of a year. incl. leap year support
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/// <summary> | |
/// Calculation based on https://da.wikipedia.org/wiki/P%C3%A5ske | |
/// </summary> | |
/// <param name="year"></param> | |
/// <returns></returns> | |
public DateTime GetEasterDateOfYear(int year) | |
{ | |
int a = year % 19; | |
int b = (int)Math.Floor(year / 100m);//Heltal (rundet) ned) af aar / 100 | |
int c = year % 100; | |
int d = (int)Math.Floor(b / 4m); | |
int e = b % 4; | |
int f = (int)Math.Floor((b + 8) / 25m); | |
int g = (int)Math.Floor((b - f + 1m) / 3); | |
int h = (19 * a + b - d - g + 15) % 30; | |
int i = (int)Math.Floor(c / 4m); | |
int k = c % 4; | |
int l = (32 + 2 * e + 2 * i - h - k) % 7; | |
int m = (int)Math.Floor((a + 11 * h + 22 * l) / 451m); | |
int n = (int)Math.Floor((h + l - 7 * m + 114) / 31m); | |
int p = (h + l - 7 * m + 114) % 31 + 1; | |
return new DateTime(year, n, p); | |
} |
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