A new service called TextPA allows you to schedule text messages to be sent at specified times up to two years in advance (who plans that far ahead anyway?). It's free to sign up, with a charge of 19p (that's pence, for all the non-Brits in the house) per message and has a nifty web interface to boot. They offer both personal and business plans, which seem to be almost identical to each other. Of course, you could also just take five minutes to figure out how the datebook on your smartphone or cellphone works. Even most low-end phones these days have some sort of way to set up reminders and alarms on them.