access VBA教材-5 日期、时间函数-小周专栏

日期函数示例
当天日期：=Date()
当日：=Day(date())
当月：=Month(date())
当年：=Year(date())
当季：=DatePart("q",Date())
把日期大写
Function Date2Chinese(iDate)
      Dim num(10)
      Dim iYear
      Dim iMonth
      Dim iDay

      num(0) = "〇"
      num(1) = "一"
      num(2) = "二"
      num(3) = "三"
      num(4) = "四"
      num(5) = "五"
      num(6) = "六"
      num(7) = "七"
      num(8) = "八"
      num(9) = "九"

      iYear = Year(iDate)
      iMonth = Month(iDate)
      iDay = Day(iDate)
      Date2Chinese = num(iYear \ 1000) + _
            num((iYear \ 100) Mod 10) + num((iYear _
            \ 10) Mod 10) + num(iYear Mod _
            10) + "年"
      If iMonth >= 10 Then
            If iMonth = 10 Then
                  Date2Chinese = Date2Chinese + _
                  "十" + "月"
            Else
                  Date2Chinese = Date2Chinese + _
                  "十" + num(iMonth Mod 10) + "月"
            End If
      Else
            Date2Chinese = Date2Chinese + _
                  num(iMonth Mod 10) + "月"
      End If
      If iDay >= 10 Then
            If iDay = 10 Then
                  Date2Chinese = Date2Chinese + _
                  "十" + "日"
            ElseIf iDay = 20 or iDay = 30 Then
                  Date2Chinese = Date2Chinese + _
                  num(iDay \ 10) + "十" + "日"
            ElseIf iDay > 20 Then
                  Date2Chinese = Date2Chinese + _
                  num(iDay \ 10) + "十" + _
                  num(iDay Mod 10) + "日"
            Else
                 Date2Chinese = Date2Chinese + _
                 "十" + num(iDay Mod 10) + "日"
            End If
      Else
            Date2Chinese = Date2Chinese + _
            num(iDay Mod 10) + "日"
      End If
End Function
算出每个月的天数
一法：
Dim a, b, c
a = Year(Now())
b = Month(Now())
c = Format((a & "/" & b + 1 & "/1"), "######") - Format((a & "/" & b & "/1"), "######")
二法：
DateDiff("d", Format(Date, "yyyy-mm-01"), Format(DateAdd("m", -1, Date), "yyyy-mm-01"))
DateDiff可以算出两个日期之间相差几天！
三法：
Day(DateAdd("d", -1, Format(Date, "yyyy-mm-01")))
day函数可以知道某个日期是这个月的第几天，我们把这个月的最后一天拿出来DAY一下！
应该还有更好的方法！
比如说可以定义一个数组，把每个月的日子放进去，或者说写一个函数算每一个月的天数
只要考虑一下闺年的问题就可以了！

如何得到某年每个月的第一天是星期几
Private Sub Command1_Click()
Dim i As Integer, A As Integer, B As Integer, C As String
A = InputBox("请输入年份", "某年每个月的第一天是星期几")
Form1.Cls
For i = 1 To 12
C = A & "-" & i & "-1"
B = Weekday(C)
Select Case B
Case vbSunday
Print A & "年" & i & "月1日是星期日"
Case vbMonday
Print A & "年" & i & "月1日是星期一"
Case vbTuesday
Print A & "年" & i & "月1日是星期二"
Case vbWednesday
Print A & "年" & i & "月1日是星期三"
Case vbThursday
Print A & "年" & i & "月1日是星期四"
Case vbFriday
Print A & "年" & i & "月1日是星期五"
Case vbSaturday
Print A & "年" & i & "月1日是星期六"
End Select
Next i
End Sub

计算天数及月初月末日期
Function 本月天数(日期 As Date) As Byte
本月天数 = DateSerial(Year(日期), Month(日期) + 1, Day(日期)) - 日期
End Function

Function 月末(日期 As Date) As Date
月末 = DateSerial(Year(日期), Month(日期) + 1, 1) - 1
End Function

Function 月初(日期 As Date) As Date
月初 = 日期 - Day(日期) + 1
End Function

本月最后一日是周几
Select
Weekday(DateAdd("m",1,DateSerial(Year(Date()),Month(Date()),1)-1)) AS 本月最后一日是周几,
下月最后一日是周几
Select
Weekday(DateAdd("m",2,DateSerial(Year(Date()),Month(Date()),1)-1)) AS 下月最后一日是周几,
本月最后一个周5到月底的天数
Select
(Weekday(DateAdd("m",1,DateSerial(Year(Date()),Month(Date()),1)-1))+1) Mod 7 AS 本月最后一个周5到月底的天数;
下月最后一个周5到月底的天数
Select
(Weekday(DateAdd("m",2,DateSerial(Year(Date()),Month(Date()),1)-1))+1) Mod 7 AS 下月最后一个周5到月底的天数;
本月最后一个周5的日期
Select
DateAdd("m",1,DateSerial(Year(Date()),Month(Date()),1))-1-(Weekday(DateAdd("m",1,DateSerial(Year(Date()),Month(Date()),1)-1))+1) Mod 7 AS 本月最后一个周5的日期;
下月最后一个周5的日期
Select
DateAdd("m",2,DateSerial(Year(Date()),Month(Date()),1))-1-(Weekday(DateAdd("m",2,DateSerial(Year(Date()),Month(Date()),1)-1))+1) Mod 7 AS 下月最后一个周5的日期;

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