获取两个日期之间的日期列表 C#

Question

如何获取两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，结果一定是这样的

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，即当前一年（2018 年）。 当然你可以将StartDate和EndDate参数化。

下面的代码没有什么特别之处；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，即在一个月的第一天选择1 而不是01）和“长”名称本月（“MMMM”这样做，检查this answer）。 如果您只需要缩写，即“Feb”代表“February”，则可以使用“MMM”（检查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();

您也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"));
    }
}

输出是

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

既然你问了，我就把Console.WriteLine换成了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));

        }
    }