Question

嗨，我在db中有每条记录的开始日期和结束日期。

我需要检查时间段在2年内分为两个季度的位置，然后显示每个记录所属的季度。

第1季包括6月9日，7月9日，8月9日第2季度包括2009年9月9日，09年10月9日第3季度包括12月9日，1月10日，2月10日第4季包括3月10日，4月10日，5月10日 Quaretr 5包括6月10日，7月10日......

e.g。 01/10/09 - 01/06/10将进入第2,3,4和4季度5

我是.NET的新手，所以任何例子都会非常感激。

Answer 1

这对你也有用。

class Range
{
    public DateTime Begin { get; private set; }
    public DateTime End { get; private set; }
    public Range(DateTime begin, DateTime end)
    {
        Begin = begin;
        End = end;
    }

    public bool Contains(Range range)
    {
        return range.Begin >= Begin && range.End <= End;
    }
}

然后使用它

        List<Range> ranges = new List<Range>();

        ranges.Add(new Range(DateTime.Now, DateTime.Now.AddMonths(3)));
        ranges.Add(new Range(DateTime.Now.AddMonths(3), DateTime.Now.AddMonths(6)));

        Range test = new Range(DateTime.Now.AddMonths(1), DateTime.Now.AddMonths(2));

        var hits = ranges.Where(range => range.Contains(test));

        MessageBox.Show(hits.Count().ToString());

Answer 2

您可能需要查看：http://msdn.microsoft.com/en-us/library/03ybds8y(v=VS.100).aspx

这可能会启动你

FindQuarter(DateTime startDate, DateTime endDate) // 01-10-09, 01-06-10
{
    startDateQuarter = GetQuarter(startDate.Month); // 2
    endDateQuarter = GetQuarter(endDate.Month);  // 1
    endDateQuarter += (endDate.Year - startDate.Year) * 4; // 5
    // fill up startDateQuarter to endDateQuarter into a list 
    // and return it // 2,3,4,5
}

GetQuarter(int month) // 6
{
    int quarter;
    // check the month value and accordingly assign one of the basic quarters 
    // using if-else construct ie, if(month>=6 && month<=8){ quarter = 1 };
    return quarter; // 1 
}

除了GetQuarter（）方法，您还可以使用字典存储月份到季度的映射

Dictionary<int, int> quarter = new Dictionary<int, int>();
quarter.Add(1,1);  //of the format Add(month,quarter)
quarter.Add(2,1);
...

现在，您可以使用GetQuarter(someDate.Month);

而不是quarter[someDate.Month];

Answer 3

    private void Form1_Load(object sender, EventArgs e)
    {
        DateTime[,] ranges = new DateTime[3,2];
        //Range 1 - Jan to March
        ranges[0, 0] = new DateTime(2010, 1, 1);
        ranges[0, 1] = new DateTime(2010, 3, 1);
        //Range 2 - April to July
        ranges[1, 0] = new DateTime(2010, 4, 1);
        ranges[1, 1] = new DateTime(2010, 7, 1);
        //Range 3 - March to June
        ranges[2, 0] = new DateTime(2010, 3, 1);
        ranges[2, 1] = new DateTime(2010, 6, 1);

        DateTime checkDate = new DateTime(2010, 4, 1);
        string validRanges = string.Empty;

        for (int i = 0; i < ranges.GetLength(0); i++)
        {
            if (DateWithin(ranges[i,0], ranges[i,1], checkDate))
            {
                validRanges += i.ToString() + " ";
            }
        }
        MessageBox.Show(validRanges);
    }

    private bool DateWithin(DateTime dateStart, DateTime dateEnd, DateTime checkDate)
    {
        if (checkDate.CompareTo(dateStart) < 0 || checkDate.CompareTo(dateEnd) > 0)
        {
            return false;
        }
        return true;
    }

Answer 4

您可以按如下方式调用IntervalInQuarters：

IntervalInQuarters(new DateTime(2007, 10, 10), new DateTime(2009, 10, 11));

该函数返回季度开始日期列表。请注意，搜索的四分之一范围是在函数本身内定义的。请根据您的具体情况进行编辑。它们的关键是确保间隔/四分之一交叉点逻辑正确。

private List<DateTime> IntervalInQuarters(DateTime myStartDate, DateTime myEndDate)
{
    DateTime quarterStart = new DateTime(2006, 06, 01);
    DateTime nextQuarterStart = new DateTime(2006, 09, 01);
    DateTime finalDate = new DateTime(2011, 01, 01);
    List<DateTime> foundQuarters = new List<DateTime>();

    while (quarterStart < finalDate)
    {
        // quarter intersects interval if:
        // its start/end date is within our interval
        // our start/end date is within quarter interval
        DateTime quarterEnd = nextQuarterStart.AddDays(-1);
        if (DateInInterval(myStartDate, quarterStart, quarterEnd) ||
            DateInInterval(myEndDate, quarterStart, quarterEnd) ||
            DateInInterval(quarterStart, myStartDate, myEndDate) ||
            DateInInterval(quarterEnd, myStartDate, myEndDate))
        {
            foundQuarters.Add(quarterStart);
        }

        quarterStart = nextQuarterStart;
        nextQuarterStart = nextQuarterStart.AddMonths(3);
    }

    return foundQuarters;
}

private bool DateInInterval(DateTime myDate, DateTime intStart, DateTime intEnd)
{
    return ((intStart <= myDate) && (myDate <= intEnd));
}

Answer 5

如果您想比较两个日期，您应该发现该季度的第一天对应于每个日期，那么您可以比较这两个日期：

using System;

namespace DataTime {
    class Program {
        static int GetQuarter (DateTime dt) {
            int Month = dt.Month;   // from 1 to 12
            return Month / 3 + 1;
        }
        static DateTime GetQuarterFirstDay (DateTime dt) {
            int monthsOfTheFirstDayOfQuarter = (GetQuarter (dt) - 1) * 3 + 1;
            return new DateTime(dt.Year, monthsOfTheFirstDayOfQuarter, 1);
            // it can be changed to
            //  return new DateTime(dt.Year, (dt.Month/3)*3 + 1, 1);
        }
        static void Main (string[] args) {
            DateTime dt1 = new DateTime (2009, 6, 9),
                     dt2 = new DateTime (2009, 7, 9),
                     dt3 = new DateTime (2009, 8, 9),
                     dt4 = new DateTime (2009, 8, 9);

            Console.WriteLine ("dt1={0}", dt1.AddMonths (1));
            Console.WriteLine ("dt2={0}", dt2.AddMonths (1));
            Console.WriteLine ("dt3={0}", dt3.AddMonths (1));

            DateTime startDate = DateTime.Now,
                     endDate1 = startDate.AddMonths(24).AddDays(1),
                     endDate2 = startDate.AddMonths(24).AddDays(-1),
                     endDate3 = startDate.AddMonths(28);
            Console.WriteLine ("Now we have={0}", startDate);
            Console.WriteLine ("endDate1={0}", endDate1);
            Console.WriteLine ("endDate2={0}", endDate2);
            Console.WriteLine ("endDate3={0}", endDate3);

            Console.WriteLine ("GetQuarterFirstDay(startDate)={0}", GetQuarterFirstDay (startDate));
            Console.WriteLine ("GetQuarterFirstDay(endDate1)={0}", GetQuarterFirstDay (endDate1));
            Console.WriteLine ("GetQuarterFirstDay(endDate2)={0}", GetQuarterFirstDay (endDate2));
            Console.WriteLine ("GetQuarterFirstDay(endDate3)={0}", GetQuarterFirstDay (endDate3));
            if (DateTime.Compare (GetQuarterFirstDay (endDate2), GetQuarterFirstDay (startDate).AddMonths (24)) > 0)
                Console.WriteLine ("> 2 Yeas");
            else
                Console.WriteLine ("<= 2 Yeas");
            if (DateTime.Compare (GetQuarterFirstDay (endDate3), GetQuarterFirstDay (startDate).AddMonths (24)) > 0)
                Console.WriteLine ("> 2 Yeas");
            else
                Console.WriteLine ("<= 2 Yeas");
        }
    }
}

产生

dt1=09.07.2009 00:00:00
dt2=09.08.2009 00:00:00
dt3=09.09.2009 00:00:00
Now we have=22.04.2010 11:21:45
endDate1=23.04.2012 11:21:45
endDate2=21.04.2012 11:21:45
endDate3=22.08.2012 11:21:45
GetQuarterFirstDay(startDate)=01.04.2010 00:00:00
GetQuarterFirstDay(endDate1)=01.04.2012 00:00:00
GetQuarterFirstDay(endDate2)=01.04.2012 00:00:00
GetQuarterFirstDay(endDate3)=01.07.2012 00:00:00
<= 2 Yeas
> 2 Yeas

已编辑：我修复了第一个版本的错误。现在它应该是正确的。

如何检查DateTime范围是否在另一个3个月的DateTime范围内

5 个答案: