access-VBA编程第三章日期、时间函数2-小周专栏

第三章日期、时间函数2

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;