2005-10-28的星期一是那一号？？？

[didibaba]

日期：yyyy-mm-dd的星期一是yyyy-mm-dd？？？
-----------------------怎么个算法，请各位指教！！！

[阿Deee]

学习
顶

[jxufewbt]

不太明白，说清楚点好吗？

[didibaba]

具体说明：
//返回date1所在周的、星期一的日期
public static DateTime(DateTime date1)
{
……//怎么写
}

[dreammaster]

你应该是问如果知道了2005-10-28，想得出这天所在一周的星期一是什么日期吧？
private DateTime GetPrivousMonday DateTime current )
{
return current.AddDays( 1 + -1 * ( int )current.DayOfWeek );
}

这个方法应该可以获取今天的上个周一，我没试过随手写的，你自己去验证一下吧

[Arucueid]

public DateTime monday(int year, int mon, int day)
{
DateTime time = new DateTime(year, mon, day);
if (time.DayOfWeek == DayOfWeek.Sunday)
return(time(-7));
else
return(time.AddDays(0 - time.DayOfWeek));
}

[Arucueid]

public static DateTime monday(int year, int mon, int day)
{
DateTime time = new DateTime(year, mon, day);
if (time.DayOfWeek == DayOfWeek.Sunday)
return(time.AddDays(-6));
else
return(time.AddDays(1 - time.DayOfWeek));
}
测试过了

[Arucueid]

晕,还是写错了
public static DateTime monday(int year, int mon, int day)
{
DateTime time = new DateTime(year, mon, day);
if (time.DayOfWeek == DayOfWeek.Sunday)
return(time.AddDays(-6));
else
return(time.AddDays(1 - (int)time.DayOfWeek));
}

[didibaba]

楼上的兄弟，谢谢了！

[xxxxxxxxx]

mark

[singlepine]

DateTime date1=Convert.ToDateTime("2005-10-28");
for(int i=0;i<=7;i++)
{
System.DateTime date=Convert.ToDateTime(date1.AddDays(i));
if(date.DayOfWeek==System.DayOfWeek.Monday)
{
Response.Write("星期一是："+date.AddDays(-7));
break;
}
}