(转) 判断某日期是否属于本周范围内

Code

/// <summary>

/// 计算本周起始日期（礼拜一的日期）

/// </summary>

/// <param name="someDate">该周中任意一天</param>

/// <returns>返回礼拜一日期，后面的具体时、分、秒和传入值相等</returns>

public static DateTime CalculateFirstDateOfWeek(DateTime someDate)

{

int i = someDate.DayOfWeek - DayOfWeek.Monday;

if (i == -1) i = 6;// i值 > = 0 ，因为枚举原因，Sunday排在最前，此时Sunday-Monday=-1，必须+7=6。

TimeSpan ts = new TimeSpan(i, 0, 0, 0);

return someDate.Subtract(ts);

}

/// <summary>

/// 计算本周结束日期（礼拜日的日期）

/// </summary>

/// <param name="someDate">该周中任意一天</param>

/// <returns>返回礼拜日日期，后面的具体时、分、秒和传入值相等</returns>

public static DateTime CalculateLastDateOfWeek(DateTime someDate)

{

int i = someDate.DayOfWeek - DayOfWeek.Sunday;

if(i != 0) i = 7 - i;// 因为枚举原因，Sunday排在最前，相减间隔要被7减。

TimeSpan ts = new TimeSpan(i, 0, 0, 0);

return someDate.Add(ts);

}

/// <summary>

/// 判断选择的日期是否是本周（根据系统当前时间决定的‘本周’比较而言）

/// </summary>

/// <param name="someDate"></param>

/// <returns></returns>

public static bool IsThisWeek(DateTime someDate)

{

//得到someDate对应的周一

DateTime someMon = CalculateFirstDateOfWeek(someDate);

//得到本周一

DateTime nowMon = CalculateFirstDateOfWeek(DateTime.Now);

TimeSpan ts = someMon - nowMon;

if (ts.Days < 0)

ts = -ts;//取正

if (ts.Days >= 6)

{

return false;

}

else

{

return true;

}

}