How Many Days Ago in Ruby

So Weiqi wondered How Many Days Ago was that. Then Eric posted a Java solution.

Since I have been attempting to learn Ruby, I figured I would attempt to implement a solution in Ruby. I would like to preface this post by stating that I am a Ruby novice and I'm sure there is a better way to do this. Here's the "How Many Days Ago Was That" in Ruby.

require "parsedate"

require "date"



def usage()

 puts "Usage: daysago.rb date"

 exit 1

end



def computeDaysBetween(from, to)

 from, to = to, from if (from > to) # Swaps the two variables

 daysAgo = 0

 from.upto(to) {|day|daysAgo+=1}

 return daysAgo

end



from = Date.parse(ARGV.shift || usage())

puts "It has been #{computeDaysBetween(from, Date.today)} since #{from}"