The TimerTrigger makes it incredibly easy to have your functions executed on a schedule. This sample demonstrates a simple use case of calling your function every 5 minutes.

For a TimerTrigger to work, you provide a schedule in the form of a cron expression(See the link for full details). A cron expression is a string with 6 separate expressions which represent a given schedule via patterns. The pattern we use to represent every 5 minutes is 0 */5 * * * *. This, in plain text, means: "When seconds is equal to 0, minutes is divisible by 5, for any hour, day of the month, month, day of the week, or year".

Documentation