date calculation in pivot table to show products over agreed date?

A

applesandpears

hi all, am new to this forum so please bear with me.
I have the following query:
1)***** Build pivot to calculate things like:

-********* Average lead time per order type
-********* Average lead time per platform
-********* Orders breached SLA per month for the last six complet
months.

2)***** Represent graphically:
a.****** Monthly order growth per customer
b.***** Current order status for those started in the last two months.

and not sure how to calculate dates in excel. I have the agreed SL
agreed date and days and also the order start and finish dates an
orders?

I appreciate any help! and thank you for your tim
 
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