Question

可能重复：
ASP.net get the next tuesday

鉴于本月的某一天，我怎样才能从那天开始接下来的星期日？

因此，如果我在2011年9月13日星期二通过，它将在9月18日返回。

Answer 1

我使用这种扩展方法：

    public static DateTime Next(this DateTime from, DayOfWeek dayOfWeek)
    {
        int start = (int)from.DayOfWeek;
        int target = (int)dayOfWeek;
        if (target <= start)
            target += 7;
        return from.AddDays(target - start);
    }

Answer 2

我认为

date.AddDays(7 - (int)date.DayOfWeek)应该这样做。

date.DayOfWeek将返回表示日期的枚举值（其中0表示星期日）。

Answer 3

        var date = DateTime.Now;
        var nextSunday = date.AddDays(7 - (int) date.DayOfWeek);

如果你需要最近的星期日，代码有点不同（好像你星期天，最近的星期日是今天）：

var nearestSunday = date.AddDays(7 - date.DayOfWeek == DayOfWeek.Sunday ? 7 : date.DayOfWeek);

Answer 4

/// <summary>
/// Finds the next date whose day of the week equals the specified day of the week.
/// </summary>
/// <param name="startDate">
/// The date to begin the search.
/// </param>
/// <param name="desiredDay">
/// The desired day of the week whose date will be returneed.
/// </param>
/// <returns>
/// The returned date is on the given day of this week.
/// If the given day is before given date, the date for the
/// following week's desired day is returned.
/// </returns>
public static DateTime GetNextDateForDay( DateTime startDate, DayOfWeek desiredDay )
{
    // (There has to be a better way to do this, perhaps mathematically.)
    // Traverse this week
    DateTime nextDate = startDate;
    while( nextDate.DayOfWeek != desiredDay )
        nextDate = nextDate.AddDays( 1D );

    return nextDate;
}

来源：

http://angstrey.com/index.php/2009/04/25/finding-the-next-date-for-day-of-week/

Answer 5

以下是代码：

int dayOfWeek = (int) DateTime.Now.DayOfWeek;
DateTime nextSunday = DateTime.Now.AddDays(7 - dayOfWeek).Date;

首先获取星期几的数值，例如：星期二= 2

然后从星期日减去它，7-2 = 5天加入以获得下一个星期日。：）

Answer 6

DateTime dt=dateTime;
do {
  dt=dt.AddDays(1);
} while(dt.DayOfWeek!= DayOfWeek.Sunday);
// 'dt' is now the next Sunday

如果日期已经是星期日，您的问题不清楚是否返回相同的日期;我假设没有，但如果我错了，请将上述内容更改为while循环。

Answer 7

使用递归的示例

    private static DateTime GetNextSunday(DateTime dt)
    {
        var tomorrow = dt.AddDays(1);
        if (tomorrow.DayOfWeek != DayOfWeek.Sunday)
        {
            GetNextSunday(tomorrow);
        }

        return tomorrow;
    }

Answer 8

public static DateTime GetNextSunday (DateTime date)
{
     if (date.DayOfWeek == DayOfWeek.Sunday)
          date = date.AddDays(1);
     while (date.DayOfWeek != DayOfWeek.Sunday)
          date = date.AddDays(1);

     return date;
}

如何获得下周日的日期？

8 个答案: