如何确定日期是否在当前星期日期之间？

Question

在C＃中，

我们如何在周日期检查某个日期？

例如：2014年6月2日

当前周：2014年2月2日 - 2014年8月2日

所以这个日期是在上述周....

Answer 1

HMM

public bool isBetween(DateTime input, DateTime date1, DateTime date2) 
    { 
     if (input > date1 && input < date2) 
      return true; 
     else 
      return false; 
    } 

？

输入=您的日期 日期1 &日期2 =开始，每周

Answer 2

如何结束：

bool inRange = (date >= lowerDate && date <= upperDate); 

Answer 3

使用此办理登机手续（最后一个参数，如果你想从FROM日期始终为1周是可选，你不需要使用最后一个参数）：

public static bool DateInside(DateTime checkDate, 
    DateTime fromDate, DateTime? lastDate = null) 
{ 
    DateTime toDate = lastDate != null ? lastDate.Value : fromDate.AddDays(6d); 
    return checkDate >= fromDate && checkDate <= toDate; 
} 

要调用的使用：

bool isDateInside = DateInside(new DateTime(2014, 02, 06), 
    new DateTime(2014, 02, 02)); // return true 

和搜索第一:)答案也在这里：How to check whether C# DateTime is within a range

如果你想检查，如果日期是在同一个星期内，那么你可以使用这个：

public static bool DateInsideOneWeek(DateTime checkDate, DateTime referenceDate) 
{ 
    // get first day of week from your actual culture info, 
    DayOfWeek firstWeekDay = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek; 
    // or you can set exactly what you want: firstWeekDay = DayOfWeek.Monday; 
    // calculate first day of week from your reference date 
    DateTime startDateOfWeek = referenceDate; 
    while(startDateOfWeek.DayOfWeek != firstWeekDay) 
    { startDateOfWeek = startDateOfWeek.AddDays(-1d); } 
    // fist day of week is find, then find last day of reference week 
    DateTime endDateOfWeek = startDateOfWeek.AddDays(6d); 
    // and check if checkDate is inside this period 
    return checkDate >= startDateOfWeek && checkDate <= endDateOfWeek; 
} 

实际周我的文化信息从2014年2月3日星期一开始（对我来说是2月3日到2月9日的一周）。如果我请与基准日（第二个参数）的任何日期今天（2014-FEB-06）我得到这样的结果：

For 2014-Feb-02 (Sunday before this week): false 
For 2014-Feb-03 (Monday inside this week): true 
For 2014-Feb-06 (Today inside this week): true 
For 2014-Feb-09 (Sunday inside this week): true 
For 2014-Feb-10 (Monday next  week): false 

您可以调用此方法来检查，如果一个日期是同一周referentional内像这样：

DateInsideOneWeek(new DateTime(2014, 02, 02), new DateTime(2014, 02, 06)); 

您可以找到这段代码本周开始和结束日期：

DateTime startDateOfWeek = DateTime.Now.Date; // start with actual date 
while(startDateOfWeek.DayOfWeek != DayOfWeek.Monday) // set first day of week in your country 
{ startDateOfWeek = startDateOfWeek.AddDays(-1d); } // after this while loop you get first day of actual week 
DateTime endDateOfWeek = startDateOfWeek.AddDays(6d); // you just find last week day 

这是你想要的？

Answer 4

这里的另一种解决方案:)

public static class DateExtensions 
{ 
    private static void Swap<T>(ref T one, ref T two) 
    { 
     var temp = one; 
     one = two; 
     two = temp; 
    } 

    public static bool IsFromSameWeek(this DateTime first, DateTime second, DayOfWeek firstDayOfWeek = DayOfWeek.Monday) 
    { 
     // sort dates 
     if (first > second) 
     { 
      Swap(ref first, ref second); 
     } 

     var daysDiff = (second - first).TotalDays; 
     if (daysDiff >= 7) 
     { 
      return false; 
     } 

     const int TotalDaysInWeek = 7; 
     var adjustedDayOfWeekFirst = (int)first.DayOfWeek + (first.DayOfWeek < firstDayOfWeek ? TotalDaysInWeek : 0); 
     var adjustedDayOfWeekSecond = (int)second.DayOfWeek + (second.DayOfWeek < firstDayOfWeek ? TotalDaysInWeek : 0); 

     return adjustedDayOfWeekSecond >= adjustedDayOfWeekFirst; 
    } 
} 

UPD：它似乎有比@Atiris解决方案至少两次更好的性能:)