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March 6th, 2004, 07:40 AM
 MattLeek Authorized User Join Date: Sep 2003 Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts
Testing for integer

Hi, im am doing some coursework in my ICT lesson, i am trying to add some Excel VBA which i am learning from reading macros i have made and i also know a bit as some is the same as Access VBA which i learning from a book.

I want to be able to work out whether the current year is a leap year by dividing the current year by four and if it is a whole number then it is. My question is how do i test the number to see if it is a whole number?

Thanks for any help.

Matthew Leek
__________________
Thanks,
Matthew

March 6th, 2004, 12:05 PM
 joefawcett Wrox Author Join Date: Jun 2003 Posts: 3,074 Thanks: 1 Thanked 38 Times in 37 Posts

If your two digit year is contained in iYear then:
[code]
Dim dblQuarter as Double
dblQuarter = iYear/4
If dblQuarter = CInt(dblQuarter) Then
'Result is integer
Else
'Result is not integer
End If
[code]
Of course this test is not valid as 1900 was not a leap but 2000 was. If you trust Microsoft's date processing you could just see if the 29th February was a valid date:
Code:
```Function IsLeapYear(iSomeYear As Long) As Boolean
IsLeapYear = Month(DateSerial(iSomeYear, 2, 29)) = 2
End Function```
This constructs a date based on 29th February and tests whether the month is still February or has moved to March.

--

Joe

March 6th, 2004, 12:46 PM
 MattLeek Authorized User Join Date: Sep 2003 Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts

Hi, i hate to be a pain, but i checked in my Access book and couldn't find the DateSerial command. Could anyone tell me how it works?

Matthew Leek

March 6th, 2004, 02:52 PM
 Birger Friend of Wrox Join Date: Jun 2003 Posts: 150 Thanks: 0 Thanked 0 Times in 0 Posts

If the only purpose is to determine whether CURRENT year is a leap year, isn't it sufficient to use this:

Sub LeapYear()

If Year(Now) Mod 4 = 0 Then
MsgBox ("It's a leap year")
Else
MsgBox ("Nope")
End If

End Sub

March 6th, 2004, 03:09 PM
 Birger Friend of Wrox Join Date: Jun 2003 Posts: 150 Thanks: 0 Thanked 0 Times in 0 Posts

It might be your book doesn't mention DateSerial, but if you use the help provided by Access you'll find an explanation.

March 6th, 2004, 03:27 PM
 Imar Wrox Author Join Date: Jun 2003 Posts: 17,089 Thanks: 80 Thanked 1,576 Times in 1,552 Posts

Nope, it's not

It's a leap year once every four year, unless the year can be divided by 100. And this last rule only applies when the year cannot be divided by 400. So, 2000 was a leap year, 1900 wasn't.

Cheers,

Imar

---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

March 6th, 2004, 03:35 PM
 Birger Friend of Wrox Join Date: Jun 2003 Posts: 150 Thanks: 0 Thanked 0 Times in 0 Posts

Oh yeah!
If you're going to use Year(Now), then who's interested in year 2000? Or 1900, for that sake!

If he's using an explicit year, he can disregard year 2000 within an If sentence or use Select Case to disregard that year.

March 6th, 2004, 03:52 PM
 Birger Friend of Wrox Join Date: Jun 2003 Posts: 150 Thanks: 0 Thanked 0 Times in 0 Posts

Could it be that the ICT -word implicates there should be special considerations when answering such question? I can see the it's some sort of interactive education!

March 7th, 2004, 09:15 AM
 joefawcett Wrox Author Join Date: Jun 2003 Posts: 3,074 Thanks: 1 Thanked 38 Times in 37 Posts

Quote:
 quote:Originally posted by MattLeek  Hi, i hate to be a pain, but i checked in my Access book and couldn't find the DateSerial command. Could anyone tell me how it works? Matthew Leek
It's not an Access function, it's part of VBA runtime library so can be used across all Microsoft Office apps. Open the help from inside Access VBA IDE and search there.

--

Joe

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