获取指定日期是今年得第几周的函数

 1 public  int WeekOfTheYear(System.DateTime dt )
 2         {            
 3            //获取
 4            CultureInfo myCI = new CultureInfo("zh-CN");
 5             System.Globalization.Calendar myCal = myCI.Calendar;
 6 
 7             //日期格式
 8             CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;
 9             DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;
10
11            //本周为第myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW )周
12             int thisWeek = myCal.GetWeekOfYear(dt, myCWR, myFirstDOW);
13           return thisWeek;
14        }
15