timestamp_rolling_file.rb

class Logging::Appenders::TimestampRollingFile < Logging::Appenders::RollingFile

  def initialize( name, opts = {} )
    super

    @date_fmt = '%Y%m%d'
    @logname_fmt.sub!(%r/\.%d/, '.%s')
  end

  def roll_files
    return unless ::File.exist?(@fn)

    # rename the base log file
    ::File.rename(@fn, sprintf(@logname_fmt, Time.now.strftime(@date_fmt)))

    # touch the age file if needed
    FileUtils.touch(@age_fn) if @age
  end

end