Rails date difference between now and created_at in days

Rails date difference between now and created_at in days

Hello i have table with ticket where i have valid_from column in DATETIME
format and validity column in INTEGER. Now i need find out how many days
is ticket active (for how many days it will inactive). Im using integer
converting to getting days but it looks that return not days.
>> valid_from #DATETIME
=> Thu, 12 Sep 2013 18:24:52 UTC +00:00
>> validity #INTEGER
=> 14
>> DateTime.now
=> Sat, 14 Sep 2013 13:17:32 -0500
>> ((valid_from + validity.days) - DateTime.now.utc).to_i
=> 1037228
command ((valid_from + validity.days) - DateTime.now.utc).to_i returned
1037228 days.. where is a mistake ? thank you