Hi

I hava a string indicate a hh/mm/ss time and some other strings indicat
operations on the string. For example , string "+5" means add 5 second.

Here is my code:

def modifytime(s1,s2)
  if s2[0,1] == "+"
    (Time.parse(s1)+s2[1,s2.length-1].to_i).to_s.split[3]
  else if s2[0,1] == "-"
      (Time.parse(s1)-s2[1,s2.length-1].to_i).to_s.split[3]
    end
  end
end

time = "00:11:20"
add5second = "+5"
sub50second = "-50"

puts modifytime(time,add5second)       => "00:11:25"
puts modifytime(time,sub50second)       => "00:10:30"

The result is what I expected but I think the modifytime is ugly.
Can I use 'eval' so that I don't need to judge "+" or "-"?
Or, any elegant solutions?
Thanks in advance.
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