Formula combining workdates and dates (again...)

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Workdates continue to plague me... :)

I have the following fields;

[estimated start] [estimated end] [estimated duration]

[actual start] [actual end] [actual duration]

[calculated end date]

Of which [estimated start] and [calculated end date] are work dates to support predecessors (the [calculated end date] feeds into the [estimated start] of the next task).  There are two formulas, one is for [estimated finish] and one is for [calculated end date]

1. [estimated finish] = [estimated start] + [estimated duration]

This one works fine, after changing [estimated duration] to a numeric (thanks to Gil for pointing that one out)

2. Formula for [calculated end date] field I have is;

If(

not IsNull ([actual finish]), [actual finish],

not IsNull ([estimated finish]), [estimated finish])

What I want it to do is basically look at the [actual finish] field, if that is not blank then use the date in that field for the [calculated finish] date else look at the [estimated finish] field and use the date there (if both are blank then remain blank)

I'm hoping I haven't totally borked the formula above but I'm getting a "expecting workdate but found date" error, if I adjust it to ToDate([actual finish]) I get a "expecting text/datetime/workdate but found date".

I'm sure there is going to be an simple answer to this one that I will kick myself about later, but I'm missing it right now, could anyone suggest a way to do this?

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Mark

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Posted 1 year ago

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Esther

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Hi Mark, thank for being so explicit in your question.

It should work I did something identic and it works , you can see any error message.


Check that all the fields are Type Date. 

([actual finish], [actual finish],[estimated finish], [estimated finish]


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Mark

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Thanks for your reply, appreciated!

I'm going to try your syntax since it's slightly different to mine so maybe I'm making a mistake there.

One other problem is that I need to use workdate for the [estimated start] and the [calculated end date] so that I can use predecessors, did you not need to use predecessors?

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Mark

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To loop back on this one, the following field set up works for predecessors

[estimated start] = work date
[estimated finish] = formula - date (using end date formula builder)
[estimated duration] = numeric

[actual start] = date
[actual end] = date
[actual duration] = formula - duration

[calculated end date] = formula - work date (as below)

If(
not IsNull ([actual finish]), [actual finish],
not IsNull ([estimated finish]), [estimated finish])

NOTE: the formula for calculated end date shows a red line and yellow highlight error at [actual finish] but still it works anyway.  Also, if editing this field it will sometimes pop up a syntax error but this isn't consistent and the formula works anyway.

I need to start using this with actual data and see if any other issues pop up.

Thanks to Esther above and Lovell from Quickbase who helped with this.