The time of day is in the form hhmm where hh is a time in hours (on a 12 or 24 hour clock). All times are converted to a 12 hour clock, and assumed to be in the next 12 hours.
If the time is preceded by `+', the alarm will go off in hours and minutes from the current time.
If no argument is given, leave prompts with "When do you have to leave?". A reply of newline causes leave to exit, otherwise the reply is assumed to be a time. This form is suitable for inclusion in a .login or .profile.
Leave ignores interrupts, quits, and terminates. To get rid of it you should either log off or use ``kill -9'' giving its process id.