C # The function of the day of the week based on the month _c# tutorial

DateTime.Now.ToString ("dddd", New System.Globalization.CultureInfo ("ZH-CN"));

Today on the Internet to see some of the implementation of C # on the basis of the day of the week to calculate the introduction:

The algorithm is as follows:
Kimlarsson Calculation formula
w= (d+2*m+3* (m+1)/5+y+y/4-y/100+y/400) MoD 7
in the formula D represents the number of days in the date, m represents the number of months, and Y represents the number of years.
Note: There is a different formula in the formula:
Consider January and February as the January or March and January or April of the previous year, for example: if it is 2004-1-10, convert it to: 2003-13-10 to substitute the formula.
The code is as follows:

 Y-year, M-month, D-Date 

string caculateweekday (int y,int m,int d)
  {
    string[] weekstr ={"Day", "one", "two", "three", "four", "Five", " VI "};

    if (M < 3)
    {
      m + =;
      if (y% = = 0 | | y%!= 0 && y% 4 = 0)
      {
        d--
      }
    } else
    {
      d = 1;
    }
    Return "Week" + weekstr[(d + 2 * m + 3 * (M + 1)/5 + y + Y/4-y/100 + y/400)% 7]; 
    

  

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