日期之间的季度计数

Question

我想计算给定时间跨度内（一年）的总季度数。

例如：

start date = 1-june -2009
end date = 18-july-2011

count should be = 10.

one more 
start date = 4-Jan-2009 
end date = 27-oct -2010
count =8.

我无法得到正确的结果。

Answer 1

你的例子是错误的：4-Jan-2009 和 27-oct -2010 之间只有 7 个季度

您可以简单地将Microsoft.VisualBasic.dll 的引用添加到您的项目中并使用DateDiff：

VB：

Public Shared Function getQuartersBetween(ByVal d1 As Date, ByVal d2 As Date) As Int32
    Return DateDiff(DateInterval.Quarter, d1, d2)
End Function

C#：

public static int getQuartersBetween(System.DateTime d1, System.DateTime d2)
{
    return Microsoft.VisualBasic.DateAndTime.DateDiff(DateInterval.Quarter, d1, d2);
}

或者您可以编写自己的实现：

public class Quarter
{

    public static long GetQuarters(DateTime dt1, DateTime dt2) 
    { 
        double d1Quarter = GetQuarter(dt1.Month); 
        double d2Quarter = GetQuarter(dt2.Month); 
        double d1 = d2Quarter - d1Quarter; 
        double d2 = (4 * (dt2.Year - dt1.Year)); 
        return Round(d1 + d2); 
    } 

    private static int GetQuarter(int nMonth) 
    { 
        if (nMonth <= 3) 
            return 1; 
        if (nMonth <= 6) 
            return 2; 
        if (nMonth <= 9) 
            return 3; 
        return 4; 
    } 

    private static long Round(double dVal) 
    { 
        if (dVal >= 0) 
              return (long)Math.Floor(dVal); 
        return (long)Math.Ceiling(dVal); 
    } 
}

或在 VB.NET 中：

Public Class Quarter

    Public Shared Function GetQuarters(ByVal dt1 As DateTime, ByVal dt2 As DateTime) As Long
        Dim d1Quarter As Double = GetQuarter(dt1.Month)
        Dim d2Quarter As Double = GetQuarter(dt2.Month)
        Dim d1 As Double = d2Quarter - d1Quarter
        Dim d2 As Double = (4 * (dt2.Year - dt1.Year))
        Return Round(d1 + d2)
    End Function

    Private Shared Function GetQuarter(ByVal nMonth As Integer) As Integer
        If nMonth <= 3 Then
            Return 1
        End If
        If nMonth <= 6 Then
            Return 2
        End If
        If nMonth <= 9 Then
            Return 3
        End If
        Return 4
    End Function

    Private Shared Function Round(ByVal dVal As Double) As Long
        If dVal >= 0 Then
            Return CLng(Math.Floor(dVal))
        End If
        Return CLng(Math.Ceiling(dVal))
    End Function

End Class

Answer 2

给你的代码：试试下面的代码

 public static void Main()
    {
        //Application.Run(new XmlTreeDisplay());
        int monthdiuff = monthDifference(Convert.ToDateTime("01/04/09"), Convert.ToDateTime("10/27/10"));
        Console.WriteLine(monthdiuff);
        int totalQuater = (monthdiuff / 3) + (monthdiuff%3);
        Console.WriteLine(totalQuater);
        Console.ReadLine();
    }

    private static int monthDifference(DateTime startDate, DateTime endDate)
    {
        int monthsApart = 12 * (startDate.Year - endDate.Year) + startDate.Month - endDate.Month;
        return Math.Abs(monthsApart);
    }

Answer 3

如果没有一些代码可以查看，我无法帮助您找到您的确切问题。

如果是我，我可能会发现日期之间的差异，然后除以一个季度的天数（91 左右）。我确信 C# 有某种日期解析模块，可以将日期作为字符串读取，为您提供两个对象，然后您可以减去它们以找出天数的差异。

Answer 4

这是根据您的假设计算季度的一种粗略形式，您可以选择修改它，因为它足够好

DateTime dt1 = new DateTime(2009, 1, 1);// new DateTime(2009, 6, 1);
DateTime dt2 = new DateTime(2010, 10, 27);// new DateTime(2011, 7, 18);
if (dt1.Month < 4)
  dt1 = new DateTime(dt1.Year,1,1);
else if (dt1.Month < 7)
  dt1 = new DateTime(dt1.Year,4,1);
else if (dt1.Month < 10)
  dt1 = new DateTime(dt1.Year,7,1);
else
  dt1 = new DateTime(dt1.Year,10,1);
if (dt2.Month < 4)
   dt2 = new DateTime(dt2.Year, 3, DateTime.DaysInMonth(dt2.Year, 3)); 
else if (dt2.Month < 7)
   dt2 = new DateTime(dt2.Year, 6, DateTime.DaysInMonth(dt2.Year, 6));
else if (dt2.Month < 10)
   dt2 = new DateTime(dt2.Year, 9, DateTime.DaysInMonth(dt2.Year, 9));
else
   dt2 = new DateTime(dt2.Year, 12, DateTime.DaysInMonth(dt2.Year, 12));

TimeSpan ts = dt2 - dt1;
int quarters = (int) ts.TotalDays/90;
Console.WriteLine(quarters);

我根据您的需要将日期设置为季度的开始和结束，然后假设 90 天的季度将 diff 转换为 int。适用于您提到的示例，看看它是否适合您

Answer 5

如果一个季度的定义是相差 90 天，那当然很简单：

    internal static int GetNumberOfQuarters(DateTime p_DtStart, DateTime p_DtEnd)
    {
        TimeSpan span = p_DtEnd.Subtract(p_DtStart);
        return (int)span.TotalDays % 90;
    }

但这不是你要找的。这个怎么样（未经测试，但你会明白的）

internal static class DateTimeTools
{
    internal static int GetNumberOfQuartersBetweenDates(DateTime startDate, DateTime endDate)
    {
        int iYearStart, iYearEnd, iMonthStart, iMonthEnd, iDayStart, iDayEnd;
        iYearStart = startDate.Year;
        iYearEnd = endDate.Year;
        iMonthStart = startDate.Month;
        iMonthEnd = endDate.Month;
        iDayStart = startDate.Day;
        iDayEnd = endDate.Day;

        int iYearDiff, iQuarterDiff, iDayDiff;
        iYearDiff = iYearEnd - iYearStart;
        iQuarterDiff = iMonthEnd % 3 - iMonthStart % 3;
        iDayDiff = iDayEnd - iDayStart;

        int iNumOfQuarters = 0;

        // at least a year difference? 
        if ((iYearDiff > 0 && iQuarterDiff > 0) || iYearDiff > 0 && iQuarterDiff == 0 && iDayDiff >= 0)
        {
            iNumOfQuarters = iYearDiff * 4 + iQuarterDiff;
        }
        // at least a quarter difference?
        // within different years
        if ((iYearDiff > 0 && iQuarterDiff <= 0)) // eg, dec 2010 - feb 2011 iYearDiff 1 iQuarterDiff -3
        {
            if ((iQuarterDiff == -3 && iDayDiff >= 0) || iQuarterDiff > -3)
            {
                iNumOfQuarters = iQuarterDiff + 4;
            }
        }
        // within the same year
        if (iYearDiff == 0 && iQuarterDiff > 0)
        {
            if ((iQuarterDiff == 1 && iDayDiff >= 0) || iQuarterDiff > 1)
            {
                iNumOfQuarters = iQuarterDiff;
            }
        }
        return iNumOfQuarters;
    }
}

问候， 妮可

Answer 6

public static string GetQuarter(this DateTime date)
        {
            var quarterList = new List<string>();

            if (date.Month >= 1 && date.Month <= 3)
                return "Q1";
            else if (date.Month >= 4 && date.Month <= 6)
                return "Q1,Q2";
            else if (date.Month >= 7 && date.Month <= 9)
                return "Q1,Q2,Q3";
            else
                return "Q1,Q2,Q3,Q4";
        }

如果您希望获得季度列表，这也可以用作扩展方法，您可以稍后使用GetQuarter().Split(new[] { ',' }).Count() 来获取计数。