[转]C#中怎么计算当前日期是在一年中的第几周？

方法一：

private int WeekOfYear(string date)

{

DateTime curDay = Convert.ToDateTime(date);

int firstdayofweek = Convert.ToInt32(Convert.ToDateTime(curDay.Year.ToString() + "- " + "1-1 ").DayOfWeek);

int days = curDay.DayOfYear;

int daysOutOneWeek = days - (7 - firstdayofweek);

if (daysOutOneWeek <= 0)

{

return 1;

}

else

{

int weeks = daysOutOneWeek / 7;

if (daysOutOneWeek % 7 != 0)

weeks ++;

return weeks + 1;

}

}

方法二：

System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();

int weekOfYear = gc.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/letian_fly/archive/2008/07/30/2739618.aspx