At  allows  fairly  complex time specifications, extending
       the POSIX.2 standard.  It accepts times of the form  HH:MM
       to  run a job at a specific time of day.	 (If that time is
       already past, the next day  is  assumed.)   You	may  also
       specify	midnight, noon, or teatime (4pm) and you can have
       a time-of-day suffixed with AM or PM for	 running  in  the
       morning or the evening.	You can also say what day the job
       will be run, by giving a date in the form  month-name  day
       with an optional year, or giving a date of the form MMDDYY
       or MM/DD/YY or DD.MM.YY.	 The specification of a date must
       follow the specification of the time of day.  You can also
       give times like now + count time-units,	where  the  time-
       units  can  be  minutes, hours, days, or weeks and you can
       tell at to run the job today by suffixing  the  time  with
       today  and  to  run the job tomorrow by suffixing the time
       with tomorrow.