unit.created_at.class
 => ActiveSupport::TimeWithZone 

 Time.zone.now.class
 => ActiveSupport::TimeWithZone 


 Time.zone.now - unit.created_at
 => 47709736.32316899 

I think that's the number of seconds that have passed between when the unit 
was created and the current time. Is this correct? If so, is there any 
easier way to find the total months that passed between two time objects 
like this?

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