问题
I Have been playing with variations of the Month... function in access query builder. I am having trouble building a date value from an expression. I am looking to create my own date that will be behind the scenes to perform some filtering and other tasks. My problem is that I cant seem to get the Month(number) function to do what I think it should be doing. Here is a summary of what I am looking for.
5/31/2012
Through something like this
DateSerial(Year(Date()),Month(5),Day(31))
Also
DateSerial(Year(Date()),Month("5"),Day("31"))
When I try these as an experssion the return is
1/30/2012
Im sure I am misunderstanding the structure. Please educate me.
回答1:
DateSerial requires three integers, year, month, day:
DateSerial(1992,5,2)
02/05/1992 ''Euro locale
Year(Date()) returns an integer, so you can substitute:
DateSerial(Year(Date()),5,31)
Interestingly, the zeroth day is the last day of the previous month:
DateSerial(2012,12,0)=30/11/2012
-- http://office.microsoft.com/en-ie/access-help/HV080206953.aspx
As an aside, do not forget that all dates are numbers.
Month(5) will equal 1, but Month(41263)=12 !
Also
?month(100)
4
?Year(100)
1900
来源：https://stackoverflow.com/questions/13979943/ms-access-built-in-function-monthnumber