Hello - I'm back!!!!

After searching I could not find an answer.    I have a workflow which has the item properties start date and end date. I need to send a notification to management if there is 30 or more days between the dates.  I have tried Set a Condition and Run If,  I can't seem to get those two work.  I have not worked with inline functions before but willing to give it a try.

Can I use item properties with the inline function or do I have to create variables?

Thanks - Suzanne