To create an Macro and alco to update an graph
 

hello,

I am trying to create an excel worksheet for the 8 hours in the day for one
month.. the number of hour the machine is down.Percentage will then update an
graph that i made.
- how do i create an macro to calcaulate the time diffrence b/w hour in day
and hour the machine is down ?
- then how do i take that percentage and update my graph with it?
Can somebdy please help me and let me know how to create an macro for all
this.
Your help will be highly appricated.

Thank you