Calculate the date of Easter given the year

find_easter.cs

public static DateTime FindEaster( int year ) {
  int month, day, century, n, m, i, j, k, z, a, l;

  century = year / 100;
  n = year % 19;
  m = (century - 17) / 25;
  i = century - (century >> 2) - (int)((century - m) / 3) + 19 * n + 15;
  j = i % 30;
  z = (int)(j / 28);
  k = j - z * (1 - z * (int)(29 / (j + 1)) * (int)((21 - n) / 11));
  a = year + (year >> 2) + k + 2 - century + (century >> 2);
  l = k - (a % 7);
  month = 3 + ((l + 40) / 44);
  day = l + 28 - 31 * (month >> 2);

  return new DateTime( year, month, day );
}