如何确定日期是否介于当前星期日期之间？

Question

在 C# 中，

我们如何检查特定日期与周日期？

例如：2014 年 6 月 2 日

当前周数：02/02/2014 - 08/02/2014

所以这个日期是在上周......

Answer 1

使用这个检查（最后一个参数是可选的，如果你想总是从fromDate开始1周，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;
 }

调用使用：

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

然后先搜索 :) 答案也在此处：How to check whether C# DateTime is within a range

如果你想检查日期是否在同一周内，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;
}

我的文化信息中的实际一周从 2014 年 2 月 3 日星期一开始（所以对我来说是 2 月 3 日到 2 月 9 日之间的那一周）。如果我检查参考日期（第二个参数）为今天（2014 年 2 月 6 日）的任何日期，我会得到以下结果：

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一个日期是否与参考日期在同一周内，如下所示：

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

您可以使用以下代码找到当前一周的开始和结束日期：

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

这是你想要的吗？

Answer 2

嗯

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 date1 & date2 = 一周的开始和结束

Answer 3

怎么样：

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

Answer 4

这是另一个解决方案:)

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;
    }
}

更新：它的性能似乎比@Atiris 解决方案至少好两倍 :)