I'm looking for a way to execute an app, or a block of code at or after a certain time. I've used cron and crontab in the terminal to arrange certain programs to run weekly at the certain date/time. However, if the computer is off at the time specified, the program doesn't run at all. What I need to do in this new application is have a program run at a certain date/time if the computer is on, or start running when the computer is turned on for the first time after that date/time has passed. Any ideas?