gistfile1.rb

  # in a module
  
  def SmsExchange.convert_time_safely_from_int_millis input
    begin
      return nil if input.to_i == 0
      Time.at(input.to_i/1000)
    rescue
      return nil
    end
  end   


# with tests

  it "should correctly convert integers to times" do
    
    SmsExchange.convert_time_safely_from_int_millis(10000).should == Time.utc(1970,1,1,0,0,10)
    SmsExchange.convert_time_safely_from_int_millis("10000").should == Time.utc(1970,1,1,0,0,10)
    
    SmsExchange.convert_time_safely_from_int_millis(nil).should == nil
    SmsExchange.convert_time_safely_from_int_millis("999999999999999999999999999999").should == nil
    SmsExchange.convert_time_safely_from_int_millis(Time.now.to_s).should == nil
    SmsExchange.convert_time_safely_from_int_millis("Tuesday January 10 11:19:39").should == nil
    
  end