Azure Function Job that will never executes

Question

I am trying to populate a CRON expression that will pretend to be never executed(at least not in this life time).

I went through this SO question https://stackoverflow.com/questions/8324306/cron-job-that-will-never-execute

But each expression in that question gives an exception Microsoft.Azure.WebJobs.Host: Error indexing method 'Cleanup'. Microsoft.Azure.WebJobs.Extensions: The schedule expression '0 0 5 31 2 ?' was not recognized as a valid cron expression or timespan string.

What are the possible expressions that will fullfill the above mentioned expectation with regard to Azure Functions?

Thank you.

Answer 1

Please check the Azure CRON expression, it's:

{second} {minute} {hour} {day} {month} {day-of-week}

And it uses the NCronTab library to interpret CRON expressions. In the github page you could find the value column can have a * or a list of elements separated by commas. That means it doesn't support ?.

So just change your expression to 0 0 5 31 2 * it will be approved. And if you don't your function running you could just disable it. You could refer to this tutorial: How to disable functions in Azure Functions.

Update:

Due to the Function will calculate the Timer to get the function running time and the 2/30 and 2/31 will never come, then it will be in a loop calculation and the year will increase until beyond the limit 9999. In this situation the function will send a exception.