usage: dm_date OPTIONS
      -h/--help        : Print help.

      Options to tell which date to print (only one of
      the following should be entered... if none are,
      'now' is printed).

      -d/--date=STRING : Print information about that date.
      -f/--file=FILE   : Print out each date (1/line) in FILE
      -r/--reference=FILE
                       : Print out the last modification
                         time of FILE

      Other options

      -R/--rfc-2822    : Print the date in RFC 2822 format
                         (any +FORMAT string is ignored)
                         Mon, 07 Aug 2006 12:34:56 -0600
      -u/--utc/--universal:
                         Converts date(s) to UT time.