Queries :: Can't Evaluate Date In Text String

Apr 17, 2014

I'm working with a table of financial transactions. I need to know the date a record relating to cash received actually arrived in our bank, but the software doesn't allow the user to enter this, so I've asked them to enter it into a text reference field, e.g. 'Other Text XX 16/04/14', and then I've got a formula - CDate(Right(Trim([RefField]),8)) - which takes the date from this reference.

This works fine, but it's really important I don't miss any of these records due to the date not being entered, so what I'm trying to make is a formula which will give me the date from the ref field as in the formula above if there is one, but if that formula gives an error (so the date has been missed out or incorrectly entered) then I want to take the date from another field, called [DateAdded] as a failsafe.

I can't work out a formula that won't give me an error, i've tried loads. First I tried :

iif(iserror(CDate(Right(Trim([RefField]),8))),[DateAdded],CDate(Right(Trim([RefField]),8)))

But that gives an error, and I think from looking at forums that Access evaluates both parts of an Iif function so it'll do that.

It seems like other people are saying that you need to use Nz, IsDate or IsNumeric or something along those lines instead of IsError to evaluate the field, but I can't get that to work as it's not a field, it's a portion of a text field.

This is my latest attempt:

Join Date: IIf(IsDate(Right(Trim([RefField]),8)),[DateAdded],[Calc Date]),

where [Calc Date] is an expression field with CDate(Right(Trim([RefField]),8)) in it, but there's the #Error again.

How can I use iif to pick either a date from a text string, or where that results in an error then another date field?

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