C# 获取输入日期为一年中的第几周

 1 /// 

 2 /// 获取指定日期，在为一年中为第几周
 3 /// 
 4 /// 指定时间
 5 /// 返回第几周
 6 private static int GetWeekOfYear(DateTime dtWeek)
 7 {
 8 　　System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();
 9 　　int weekOfYear = gc.GetWeekOfYear(dtWeek,System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);
10 　　return weekOfYear;
11 }