Timestamp in log files

I found this yesterday as an option for adding timestamps to the rails log files. Is this the best way to accomplish adding date and time stamps to the log files?

http://programmingishard.com/code/463

require 'logger' class Logger    alias format_message old_format_message

   def format_message(severity, timestamp, progname, msg)      "#{timestamp.to_s(:log_format)} [#{severity}] - #{msg}\n"    end end