o  If you do not enter .SET DATE or .SET TIME, entering a $$time,
       $$date, or any of the appropriate date or time parameters with
       the substitute flag pair ($$) will give you the date or time
       that DSR began processing the file.

    o  If you enter either of these .SET commands, you can retain
       a previous value by omitting its value from the command. You
       must, however, type any comma that would have followed it.

    o  If you enter either command without specifying any values for
       it, you will get the current date or the time as of the second
       the command is executed.