Can we do calculation using DMN

Can we do calculations using DMN.
I have a requirement where I have two input parameters one of them is date.
Based on the second parameter I have to do some transformation on the date and produce the transformed date as output.
Can we do this via DMN

There’s a certain amount of calculation possible.
You can check out the docs for details:

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Also is there any way to include variables in output column of dmn.