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or 0 0 1 1 * runs once a year at midnight in the morning of January 1
Webcron
If you don't have access to your system crontab, and don't want to use front end call as a trigger, you may use webcron service. There are many providers (e. g. https://www.easycron.com) that offers free or premium service.
Pseudo-cron
The pseuco-cron feature from CONTENIDO adapts the general logic from the default cron feature. The difference between the two implementations is that cronjobs are controlled through a operating system timer and the CONTENIDO pseudo cron 'timer' is a call of the frontend.
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