Question

我有两个日期，如2017-10-05和2018-02-20，我的间隔结果应为：

使用DateTime对象在C＃中执行此操作的任何建议吗？

更新＃1

我首先提到的问题是现金流量管理的真实情况，因此我不得不更改日期规格以计算利息，差异和文明。这个代码我用于此目的：

foreach (DataRow dr in DTFlussi.Rows)
{
    DateTime d1 = Convert.ToDateTime(DTFlussi.Rows[n]["data_scadenza"]).Date;
    DateTime d2 = Convert.ToDateTime(DTFlussi.Rows[n + 1]["data_scadenza"]).Date;
    int[] date = RecuperoDate(d1, d2);

    if (saldoConto > 0)
        InteressiAttivi(saldoConto, date, DTOneri, d1, d2);
    else if (saldoConto <= 0 && saldoConto >= (fidoConto * -1))
    {
        //esempio di interessi FIDO al 2%
        InteressiFido(saldoConto, date, tassoFIDO, DTOneri, d1, d2);
    }
    else if (saldoConto < 0 && saldoConto < (fidoConto * -1))
    {
        //esempio con interessi FIDO al 2% e interessi EXTRAFIDO al 4%
        InteressiExtraFido(saldoConto, fidoConto, date, tassoFIDO, tassoEXTRAFIDO, DTOneri, d1, d2);
    }
    catch (Exception)
    {

    }
    n++;
}

RecuperoDate的代码是：

public int[] RecuperoDate(DateTime d1, DateTime d2)
{
    int[] diff = new int[2];

    //Gestione anno bisestile Febbrario
    int giorniFebbraio = 0;
    if (DateTime.IsLeapYear(d1.Year))
        giorniFebbraio = 29;
    else
        giorniFebbraio = 28;

    try
    {
        #region MESE 1

        if (d1.Date >= new DateTime(d1.Year, 1, 1) && d1.Date <= new DateTime(d1.Year, 1, 31) && d2.Date >= new DateTime(d1.Year, 1, 31))
        {
            DateTime Mese1 = new DateTime(d1.Year, 1, 31).Date;
            diff[0] = (int)(Mese1 - d1).TotalDays;
            diff[1] = (int)(d2 - Mese1).TotalDays;
        }

        #endregion

        //NOTE: incomplete code because is the same thing for the other months (February - December)

这是获得余额的后续变化所必需的，在计算结束时这是我想要的：

Answer 1

创建一个数组。

            DateTime[] dateArray = {
                                       DateTime.Parse("2017-10-05"),
                                       DateTime.Parse("2017-10-31"),
                                       DateTime.Parse("2017-11-30"),
                                       DateTime.Parse("2017-12-31"),
                                       DateTime.Parse("2018-02-20"),
                                       DateTime.Parse("2018-02-28")
                                   };

Answer 2

我认为您所寻找的是每个月的最新一天。 DateTime结构提供静态DaysInMonth方法，将年份和月份作为参数。

从那里开始，您可以从开始日期到结束日期进行迭代并获取日期。

此代码会将所需的日期打印到控制台，但格式不是您要求的格式：

    DateTime start = new DateTime(2017,10,05);
    DateTime end = new DateTime(2018,2,20);
    DateTime current = start;

    Console.WriteLine(start.ToShortDateString());
    int startLastDay = DateTime.DaysInMonth(start.Year, start.Month);
    if(startLastDay != start.Day)
        Console.WriteLine(new DateTime(start.Year, start.Month, startLastDay).ToShortDateString());


    while(current < end)
    {
        current = current.AddMonths(1);
        if(current > end)
            Console.WriteLine(end.ToShortDateString());

        int lastDay = DateTime.DaysInMonth(current.Year, current.Month);
        current = new DateTime(current.Year, current.Month, lastDay);
        Console.WriteLine(current.ToShortDateString());
    }

编辑：

这是我机器上的控制台输出：

Answer 3

public List<string> GetIntervals(DateTime startDate, DateTime endDate) {
    List<string> result = new List<string>();
    result.Add(startDate.ToShortDateString());
    result.Add(endDate.ToShortDateString());
    DateTime target = startDate;
    while (target <= endDate) {
        result.Add(new DateTime(target.Year, target.Month, DateTime.DaysInMonth(target.Year, target.Month)).ToShortDateString());
        target = target.AddMonths(1);
    }
    result = result.Distinct().ToList();
    result.Sort();
    return result;
}

Answer 4

var startDate = new DateTime(2017, 10, 5);
        var endDate = new DateTime(2018, 2, 20);

        var firstDayofMonth = new DateTime(startDate.Year, startDate.Month, 1).AddMonths(1);

        Console.WriteLine(startDate.ToShortDateString());

        while (true)
        {
            var dateToCompare = firstDayofMonth.AddDays(-1);

            //Last month
            if (dateToCompare >= endDate)
            {
                if (dateToCompare > endDate)
                {
                    Console.WriteLine(endDate.ToShortDateString());
                }
                Console.WriteLine(dateToCompare.ToShortDateString());
                break;
            }

            if (dateToCompare != startDate)
            {
                Console.WriteLine(dateToCompare.ToShortDateString());
            }

            firstDayofMonth = firstDayofMonth.AddMonths(1);
        }

两个日期之间的每月间隔

4 个答案: