C# 根据日期计算星期几

 region 根据年月日计算星期几(Label2.Text=CaculateWeekDay(,,);)
 /// <summary>
 /// 根据年月日计算星期几(Label2.Text=CaculateWeekDay(2004,12,9);)
 /// </summary>
 /// <param name="y">年</param>
 /// <param name="m">月</param>
 /// <param name="d">日</param>
 /// <returns></returns>
 public static string CaculateWeekDay(int y,int m, int d)
 {
 if(m==) m=;
 if(m==) m=;
 int week=(d+*m+*(m+)/+y+y/-y/+y/)%+;
 string weekstr="";
 switch(week)
 {
 case : weekstr="星期一"; break;
 case : weekstr="星期二"; break;
 case : weekstr="星期三"; break;
 case : weekstr="星期四"; break;
 case : weekstr="星期五"; break;
 case : weekstr="星期六"; break;
 case : weekstr="星期日"; break;
 }
 return weekstr;
 }
 #endregion