calculate the date of Easter

Easter.cs

private static DateTime Easter(int year) 
{
    int a = year%19;
    int b = year/100;
    int c = (b - (b/4) - ((8*b + 13)/25) + (19*a) + 15)%30;
    int d = c - (c/28)*(1 - (c/28)*(29/(c + 1))*((21 - a)/11));
    int e = d - ((year + (year/4) + d + 2 - b + (b/4))%7);
    int month = 3 + ((e + 40)/44);
    int day = e + 28 - (31*(month/4));
    return new DateTime(year, month , day);
}