gistfile1.rb

def convert_time_safely time_input
  begin
    return nil if time_input.to_i == 0
    Time.at(time_input.to_i/1000)
  rescue
    return nil
  end
end

puts "10000 -> #{convert_time_safely(10000)}"
puts "'10000' -> #{convert_time_safely('10000')}"
puts "nil -> #{convert_time_safely(nil)}"
puts "overflow -> #{convert_time_safely("999999999999999999999999999999")}"
puts "Time.now -> #{Time.now}"
puts "Time.now.to_s -> #{convert_time_safely(Time.now.to_s)}"
puts "Time.now.to_s -> #{convert_time_safely(Time.now.to_s)}"
puts "'Tuesday January 10 11:19:39' -> #{convert_time_safely('Tuesday January 10 11:19:39')}"


=begin

10000 -> Thu Jan 01 10:00:10 +1000 1970
'10000' -> Thu Jan 01 10:00:10 +1000 1970
nil -> 
overflow -> 
Time.now -> Tue Jan 10 11:21:10 +1100 2012
Time.now.to_s -> 
Time.now.to_s -> 
'Tuesday January 10 11:19:39' -> 

=end