A set of libraries for performing periodic actions on the arduino platform.

Illustrative example:

http://github.com/aaronds/arduino-unix-time/blob/master/UnixTimeCron/examples/unix_time_cron_example/unix_time_cron_example.pde

UnixTime - An abstract class for a time source to inherit from.
MillisRTC - A time source using the millis() command.
Timer2RTC - A much better time source requiring an external 37Khz oscillator.
UnixTimeCron - The library which performs periodic actions (see examples folder).

Download zips to be extracted in the Arduino libraries folder from:

http://github.com/aaronds/arduino-unix-time/downloads