Sequens programmatiunculum ad Horologium Romanum pertinens conscripsi ut peregrinatoribus qui ab Imperio Romano ad haec tempora iter faciunt auxilio sit. Immo vero etiam aliis lectoribus forsitan utile esse possit.

(That is: "Horologium Romanum – The Roman Clock app – was written as an aid to time travellers from the Roman Empire who have chosen to visit the 21st century. Even if you do not fall into that group you may still find it useful.")

Horologium Romanum is a Roman numeral digital clock - using the Roman calendar, with a daily Latin proverb, and help text in Latin (or English if you really want). It also gives you the option of using the inconvenient and impractical Roman time system, though if you do, you will never be on time for an appointment again.