Datediff, if field is blank

  • Thread starter Thread starter Bjarni
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Bjarni

I am new to coding so I could use some help with the
datediff function in a case when field is blank.

I have a table with these fields:

CO #1 (plans Start) Date
CO Sign Off Date

In a query I have the following expresion:
CO Elapsed Time: GetElapsedDays([CO #1 (plans Start) Date]-
[CO Sign Off Date])

My Module contains:
Option Explicit

Function GetElapsedDays(interval)
Dim days As Long
days = Int(CSng(interval))
GetElapsedDays = days & " Days "

End Function

this works fine when both CO #1 (plans Start) Date &
CO Sign Off Date have dates in them, otherwise my query
returns a Run time error #94, invalid use of Null. What
would be the correct way of handling the "if field is
blank" routine?

I know this is an easy one but I can not get it to work
correctly.......

TIA

Bjarni
 
try wrapping your routine in a date test something like
this:

If IsDate (DateVariableComingIn) then
<Do you work here>
Else
<Do something else like:>
Exit Function
msgbox "Bad.."
Goto ErrorFound
End If

-Cameron Sutherland
 
Bjarni said:
I am new to coding so I could use some help with the
datediff function in a case when field is blank.

I have a table with these fields:

CO #1 (plans Start) Date
CO Sign Off Date

In a query I have the following expresion:
CO Elapsed Time: GetElapsedDays([CO #1 (plans Start) Date]-
[CO Sign Off Date])

My Module contains:
Option Explicit

Function GetElapsedDays(interval)
Dim days As Long
days = Int(CSng(interval))
GetElapsedDays = days & " Days "

End Function

this works fine when both CO #1 (plans Start) Date &
CO Sign Off Date have dates in them, otherwise my query
returns a Run time error #94, invalid use of Null. What
would be the correct way of handling the "if field is
blank" routine?
Click to expand...


No need for you to create a function. You can use the
built-in DateDiff function.

How you do it depends on what you want the result to be when
one of the fields is null. This will return a Null when one
of the fields is Null:

CO Elapsed Time: DateDiff("d ,[CO Sign Off Date], [CO #1
(plans Start) Date])
 
Thank you both for the answer, I went ahead and used
Marshalls answer:
CO Elapsed Time: DateDiff("d",[CO Sign Off Date], [CO #1
(plans Start) Date])
Click to expand...

Works like a Charm!

Bjarni
-----Original Message-----
Bjarni said:
I am new to coding so I could use some help with the
datediff function in a case when field is blank.

I have a table with these fields:

CO #1 (plans Start) Date
CO Sign Off Date

In a query I have the following expresion:
CO Elapsed Time: GetElapsedDays([CO #1 (plans Start) Date]-
[CO Sign Off Date])

My Module contains:
Option Explicit

Function GetElapsedDays(interval)
Dim days As Long
days = Int(CSng(interval))
GetElapsedDays = days & " Days "

End Function

this works fine when both CO #1 (plans Start) Date &
CO Sign Off Date have dates in them, otherwise my query
returns a Run time error #94, invalid use of Null. What
would be the correct way of handling the "if field is
blank" routine?
Click to expand...


No need for you to create a function. You can use the
built-in DateDiff function.

How you do it depends on what you want the result to be when
one of the fields is null. This will return a Null when one
of the fields is Null:

CO Elapsed Time: DateDiff("d ,[CO Sign Off Date], [CO #1
(plans Start) Date])
Click to expand...
 
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