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ruby-1.9.2-p180 :001 > p = Project.find(1)

  Project Load (0.6ms)  SELECT `projects`.* FROM `projects` WHERE `projects`.`id` = 1 LIMIT 1

 => #<Project id: 1, name: "The First One", startDate: "2011-06-01", endDate: "2011-06-26", created_at: "2011-06-25 17:54:48", updated_at: "2011-06-26 12:33:33", pourcentDate: 102>

 

ruby-1.9.2-p180 :002 > timeTotal = p.endDate - p.startDate

 => (25/1)

 

ruby-1.9.2-p180 :004 > timeUsed = DateTime.now - p.startDate

 => (183782028643/7200000000)

 

ruby-1.9.2-p180 :005 > puts ((timeUsed / timeTotal) * 100)

183782028643/1800000000

 => nil

 

ruby-1.9.2-p180 :006 > puts ((timeUsed / timeTotal) * 100).to_i

102

 => nil