.net - 获取自定义日期差异的函数

Question

我正在尝试编写一个通用函数，以自定义格式返回两个日期之间的差异，但有人报告我，我的代码片段有一个错误，例如试图获取这两个日期之间的差异:

15/08/2013 - 02/09/2013 

我的函数返回负值，并且还存在 1 个月的差异，因为 09 大于 08，所以它无法按我需要的方式工作:

1 Months, -1 Weeks, -6 Days, 0 Hours, 0 Minutes and 0 Seconds

预期结果是这样的:

0 Months, 2 Weeks, 4 Days, 0 Hours, 0 Minutes and 0 Seconds

有人可以帮助我纠正某些日期的错误吗？

这是我的代码:

#Region " Date Difference "

    ' Date Difference
    '
    ' // By Elektro H@cker
    '
    ' Examples :
    '
    ' MsgBox(DateDifference(DateTime.Parse("01/03/2013"), DateTime.Parse("10/04/2013"))) ' Result: 1 Months, 1 Weeks, 2 Days, 0 Hours, 0 Minutes and 0 Seconds
    ' MsgBox(DateDifference(DateTime.Parse("01/01/2013 14:00:00"), DateTime.Parse("02/01/2013 15:00:30"))) ' Result: 0 Months, 0 Weeks, 1 Days, 1 Hours, 0 Minutes and 30 Seconds

    Private Function DateDifference(ByVal Date1 As DateTime, ByVal Date2 As DateTime) As String

        Dim MonthDiff As String, WeekDiff As String, _
            DayDiff As String, HourDiff As String, _
            MinuteDiff As String, SecondDiff As String

        MonthDiff = Convert.ToString(DateDiff("M", Date1, Date2))
        WeekDiff = Convert.ToString(DateDiff("d", Date1.AddMonths(DateDiff("M", Date1, Date2)), Date2) \ 7)
        DayDiff = Convert.ToString(DateDiff("d", Date1.AddMonths(DateDiff("M", Date1, Date2)), Date2) - (WeekDiff * 7))
        HourDiff = Convert.ToString(DateDiff("h", Date1.AddHours(DateDiff("h", Date1, Date2)), Date2) - (Date1.Hour - Date2.Hour))
        MinuteDiff = Convert.ToString(DateDiff("n", Date1.AddMinutes(DateDiff("n", Date1, Date2)), Date2) - (Date1.Minute - Date2.Minute))
        SecondDiff = Convert.ToString(DateDiff("s", Date1.AddSeconds(DateDiff("s", Date1, Date2)), Date2) - (Date1.Second - Date2.Second))

        Return String.Format("{0} Months, {1} Weeks, {2} Days, {3} Hours, {4} Minutes and {5} Seconds", _
                             MonthDiff, WeekDiff, DayDiff, HourDiff, MinuteDiff, SecondDiff)

    End Function

#End Region

UPDATE:

我正在尝试这样做，但现在如何减去周数？

私有(private)函数 DateDifference(ByVal Date1 As DateTime, ByVal Date2 As DateTime) As String

Dim MonthDiff As String, WeekDiff As String, _
   DayDiff As String, HourDiff As String, _
   MinuteDiff As String, SecondDiff As String

MonthDiff = Date2.Month - Date1.Month

' WeekDiff = Date2.Month - Date1.Month

DayDiff = Date2.Day - Date1.Day

HourDiff = Date2.Hour - Date1.Hour

MinuteDiff = Date2.Minute - Date1.Minute

SecondDiff = Date2.Second - Date1.Second

'  MsgBox((Date2 - Date1).ToString("dd"))

Return String.Format("{0} Months, {1} Weeks, {2} Days, {3} Hours, {4} Minutes and {5} Seconds", _
                      MonthDiff, WeekDiff, DayDiff, HourDiff, MinuteDiff, SecondDiff)

结束函数

UPDATE 2:

我正在尝试使用其他方法重写它以获得日期准确性，但我完全迷失了:

Private Function DateDifference(ByVal Date1 As DateTime, ByVal Date2 As DateTime) As String

    Dim DayDiff As Long = Date2.Subtract(Date1).Days
    Dim HourDiff As Long = Date2.Subtract(Date1).Hours
    Dim MinuteDiff As Long = Date2.Subtract(Date1).Minutes
    Dim SecondDiff As Long = Date2.Subtract(Date1).Seconds
    Dim MilliDiff As Long = Date2.Subtract(Date1).Milliseconds

    Dim MonthDiFF As Long
    Dim WeekDiFF As Long

    Select Case (DayDiff Mod DateTime.DaysInMonth(Date1.Year, Date1.Month))

        Case Is <= 0
            MonthDiFF = 0

        Case Is = 1, Is <= 28
            MonthDiFF = 1

        Case Is > 28

    End Select

    MsgBox(DayDiff Mod DateTime.DaysInMonth(Date1.Year, Date1.Month))
    MsgBox(MonthDiFF)

    ' Return String.Format("{0} Months, {1} Weeks, {2} Days, {3} Hours, {4} Minutes and {5} Seconds", _
    '                          MonthDiff, WeekDiff, t.Days, t.Hours, t.Minutes, t.Seconds)

End Function

UPDATE 3:

我更接近编写代码，但就像我说过的那样，我失去了计算能力:

Private Function DateDifference(ByVal Date1 As DateTime, ByVal Date2 As DateTime) As String

    Dim DayDiff As Long = Date2.Subtract(Date1).Days
    Dim HourDiff As Long = Date2.Subtract(Date1).Hours
    Dim MinuteDiff As Long = Date2.Subtract(Date1).Minutes
    Dim SecondDiff As Long = Date2.Subtract(Date1).Seconds
    Dim MilliDiff As Long = Date2.Subtract(Date1).Milliseconds

    Dim MonthDiFF As Long
    Dim WeekDiFF As Long

    For X As Short = CShort(Date1.Month) To CShort(Date2.Month)

        MonthDiFF =
        MsgBox(DayDiff - DateTime.DaysInMonth(Date1.Year, X))

        'MsgBox(DateTime.DaysInMonth(Date1.Year, X))
    Next

    ' MsgBox(DayDiff - DateTime.DaysInMonth(Date1.Year, Date1.Month))
    ' MsgBox(MonthDiFF)

    ' Return String.Format("{0} Months, {1} Weeks, {2} Days, {3} Hours, {4} Minutes and {5} Seconds", _
    '                          MonthDiff, WeekDiff, t.Days, t.Hours, t.Minutes, t.Seconds)

End Function

Answer 1

这会以编程方式计算月份和星期，然后使用 TimeSpan对于其余部分。月份计算会很棘手，它使用 AddMonths 的智能行为。 .

Private Function DateDifference(ByVal Date1 As DateTime, ByVal Date2 As DateTime) As String
    Dim MonthDiff = 0
    While Date1 <= Date2
        Date1 = Date1.AddMonths(1)
        MonthDiff += 1
    End While
    MonthDiff -= 1
    Date1 = Date1.AddMonths(-1)
    Dim t As TimeSpan = Date2 - Date1
    Dim WeekDiff As Integer = t.Days \ 7
    t = t - TimeSpan.FromDays(WeekDiff * 7)
    Return String.Format("{0} Months, {1} Weeks, {2} Days, {3} Hours, {4} Minutes and {5} Seconds", _
                             MonthDiff, WeekDiff, t.Days, t.Hours, t.Minutes, t.Seconds)
End Function