I finally got around to translating my PHP Cron / Calendar integration for ZoneMinder done, this can be found Here.
These scripts are provide as is, so feel free to change them to fit your needs, but just a heads up, the code is a mess since i am not that much of a php programmer, the code might be a bit confusing ( Iknow it is to me sometimes hehe

There is a ReadMe.txt inside the tgz file that should explain how to use / configure the scripts.