How does Rails implement the "date magic" mechanism on numbers? -

In railways (but not plain Ruby) can say things like:

  t = 
  
 
 2.days t.inspect   
 = & gt; "2 days".  
  t.to_i   
 = & gt; 172800  
 This rail patch looks like Fixation, so it examines the string with the number of seconds and descriptions shown by the interval. How does it basically work?  itemprop = "text"> 
 Core extensions in ActiveSupport, such as string, object,  
 ActiveSupport is adding "days" for a number It is very basic:  
 
 1 day 24 hours  
 1 hour 60 minutes