DateDiff in E9

How do I calculate the difference between two dates in E9, i.e. DueDate - StartDate

The DATEDIFF function that works in E10 does not work in E9.

Welcome to the wonderful world of ABL… cough
https://documentation.progress.com/output/ua/OpenEdge_latest/index.html#page/wp-abl-datatypes/adding,-subtracting,-and-obtaining-specific-time.html

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sneeze - thanks but now I am more confused. This does not look like Epicor BAQ speak, but rather progress code.

I tried every possible configuration to no avail. Would you be so kind to as provide example. I have a BAQ in v9.04 (yuck) . I simply want the difference between the start and due dates within a job operation.

Baqs use progress for calculated fields

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