A calculated field in Access returns time - But if the calculated field is blank it returns error

Hi Experts

I think this might be an easy question for Access Experts :-)

I have a calculated field that has to return the starttime for bowling Lanes. But in the same file, I have the transactions, related to other form of sales (where there is no starting time.

If there is a starting time, below function Works great. [Placement] is a textfield containing other information as well.

Starttime: TimeSerial(Left([Placement];2);Mid([placement];3;2);"00")

If there is no starttime, I want my Query to return a blank cell.

regards

Jørgen
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JorgenConsultantAsked:
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MacroShadowCommented:
If when there is no start time Placement is blank, the following will work:
Starttime: IIF(Len(Placement)=0,"",(TimeSerial(Left([Placement];2);Mid([placement];3;2);"00"))

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If it will contain other information, I'll have to see a sample of what it can contain.
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Gustav BrockCIOCommented:
A blank cell is Null, thus:

Starttime: IIf(IsDate(Left([Placement];2) & ":" & Mid([Placement];3;2));TimeSerial(Left([Placement];2);Mid([Placement];3;2);0);Null)

/gustav
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