weeknumbers ms 访问查询

问题描述

我想根据以下条件在 ms 访问中获取周数：

https://www.kalender-365.nl/kalender-2021.html

我的表情：

test: DatePart("ww",#01/01/2021#,2,2)

这将返回 1 而不是周 53。我该怎么做才能返回 53？

语法：

DatePart(datepart,date,firstdayofweek,firstweekofyear)

2 = 星期一 (firstdayofweek)

2 = 使用一年中至少有 4 天的第一周 (firstdayofyear)

解决方法

您可能还需要匹配的 ISO 年份：

Public Const MaxWeekValue           As Integer = 53
Public Const MinWeekValue           As Integer = 1
Public Const MaxMonthValue          As Integer = 12
Public Const MinMonthValue          As Integer = 1



' Returns the ISO 8601 week of a date.
' The related ISO year is returned by ref.
'
' 2016-01-06. Gustav Brock,Cactus Data ApS,CPH.
'
Public Function Week( _
    ByVal Date1 As Date,_
    Optional ByRef IsoYear As Integer) _
    As Integer

    Dim Month       As Integer
    Dim Interval    As String
    Dim Result      As Integer
    
    Interval = "ww"
    
    Month = VBA.Month(Date1)
    ' Initially,set the ISO year to the calendar year.
    IsoYear = VBA.Year(Date1)
    
    Result = DatePart(Interval,Date1,vbMonday,vbFirstFourDays)
    If Result = MaxWeekValue Then
        If DatePart(Interval,DateAdd(Interval,1,Date1),vbFirstFourDays) = MinWeekValue Then
            ' OK. The next week is the first week of the following year.
        Else
            ' This is really the first week of the next ISO year.
            ' Correct for DatePart bug.
            Result = MinWeekValue
        End If
    End If
        
    ' Adjust year where week number belongs to next or previous year.
    If Month = MinMonthValue Then
        If Result >= MaxWeekValue - 1 Then
            ' This is an early date of January belonging to the last week of the previous ISO year.
            IsoYear = IsoYear - 1
        End If
    ElseIf Month = MaxMonthValue Then
        If Result = MinWeekValue Then
            ' This is a late date of December belonging to the first week of the next ISO year.
            IsoYear = IsoYear + 1
        End If
    End If
    
    ' IsoYear is returned by reference.
    Week = Result
        
End Function