Question

我如何获得2个日期之间的日期范围列表

例如，

start date是2月12日 end date是5月23日

所以，结果必须像

12-Feb to 28-Feb 1-Mar to 31-Mar 1-April to 30-April 1-May to 23-May

Answer 1

假设您只检查一年，即当前的一年（2018年）。当然，您可以StartDate和EndDate参数化。

下面的代码没什么特别之处;我使用"d-MMMM"作为日期格式，因为您似乎要求最少天数（"d"这样做，即在第一天选择1而不是01月份）和月份的“长”名称（“MMMM”这样做，检查this answer）。如果您只想要缩写，即“二月”为“二月”，您可以使用“MMM”（选中this other answer）。

DateTime StartDate = new DateTime(2018, 2, 12);
DateTime EndDate = new DateTime(2018, 5, 23);

for (int i = 0; i <= EndDate.Month - StartDate.Month; i++)
{
    DateTime FirstDay = new DateTime(2018, StartDate.Month + i, 1);
    if (i == 0)
    {
        FirstDay = StartDate;
    }
    DateTime LastDay = new DateTime(2018, StartDate.Month + i, DateTime.DaysInMonth(2018, FirstDay.Month));
    if (i == EndDate.Month - StartDate.Month)
    {
        LastDay = EndDate;
    }
    Console.WriteLine(FirstDay.ToString("d-MMMM") + " to " + LastDay.ToString("d-MMMM"));
}

Console.ReadLine();

您还可以使用以下代码使其“跨年”：

static void Main(string[] args)
{
    PrintDateList(new DateTime(2018, 2, 12), new DateTime(2018, 5, 23));
    PrintDateList(new DateTime(2018, 11, 12), new DateTime(2019, 2, 23));

    Console.ReadLine();
}

private static void PrintDateList(DateTime StartDate, DateTime EndDate)
{
    Console.WriteLine("");
    int TotalMonths = EndDate.Month - StartDate.Month +
                     (EndDate.Year - StartDate.Year) * 12;

    int CurrentYear = StartDate.Year;
    int MonthsToSubtract = 0;

    for (int i = 0; i <= TotalMonths; i++)
    {
        int CurrentMonth = StartDate.Month + i;

        if (StartDate.Month + i > 12)
        {
            if ((StartDate.Month + i) % 12 == 1)
            {
                CurrentYear++;
                Console.WriteLine(CurrentYear.ToString());
                MonthsToSubtract = StartDate.Month + i - 1;
            }

            CurrentMonth = StartDate.Month + i - MonthsToSubtract;
        }

        DateTime FirstDay = new DateTime(CurrentYear, CurrentMonth, 1);
        if (i == 0)
        {
            FirstDay = StartDate;
        }
        DateTime LastDay = new DateTime(CurrentYear, CurrentMonth, DateTime.DaysInMonth(CurrentYear, FirstDay.Month));
        if (i == TotalMonths)
        {
            LastDay = EndDate;
        }
        Console.WriteLine(FirstDay.ToString("d-MMMM") + " to " + LastDay.ToString("d-MMMM"));
    }
}

输出

2月12日至2月28日 3月1日至3月31日 4月1日至4月30日 5月1日至5月23日
11月12日至11月30日 12月1日至12月31日 1月1日至1月31日 2月1日至2月23日期间

自从您提问后，我将Console.WriteLine替换为List：

private static void PrintDateList(DateTime StartDate, DateTime EndDate)
{
        List<Tuple<DateTime>> EventsDatesRangeList = new List<Tuple<DateTime>>();
        Console.WriteLine("");
        int TotalMonths = EndDate.Month - StartDate.Month +
                        (EndDate.Year - StartDate.Year) * 12;

        int CurrentYear = StartDate.Year;
        int MonthsToSubtract = 0;

        for (int i = 0; i <= TotalMonths; i++)
        {
            int CurrentMonth = StartDate.Month + i;

            if (StartDate.Month + i > 12)
            {
                if ((StartDate.Month + i) % 12 == 1)
                {
                    CurrentYear++;
                    Console.WriteLine(CurrentYear.ToString());
                    MonthsToSubtract = StartDate.Month + i - 1;
                }

                CurrentMonth = StartDate.Month + i - MonthsToSubtract;
            }

            DateTime FirstDay = new DateTime(CurrentYear, CurrentMonth, 1);
            if (i == 0)
            {
                FirstDay = StartDate;
            }
            DateTime LastDay = new DateTime(CurrentYear, CurrentMonth, DateTime.DaysInMonth(CurrentYear, FirstDay.Month));
            if (i == TotalMonths)
            {
                LastDay = EndDate;
            }
                Console.WriteLine(FirstDay.ToString("d-MMMM") + " to " + LastDay.ToString("d-MMMM"));
            EventsDatesRangeList.Add(new Tuple<DateTime>(FirstDay));
            EventsDatesRangeList.Add(new Tuple<DateTime>(LastDay));

        }
    }

获取2个日期之间的日期列表C＃

1 个答案: