Azure function not executing on scheduled time for IST time zone

Question

I have set function to execute between 8 AM to 6 PM daily (IST). But it is executing at 11AM. CRON expression "0 0 8-18 * * *"

Answer 1

@Rahul Mirajgave NCRONTAB expression supports both five field and six field format. Looks like you have might have missed one while posting your query.

0 0 8-18 * *  

The default time zone used with the CRON expressions is Coordinated Universal Time (UTC). To have your CRON expression based on another time zone, create an app setting for your function app named WEBSITE_TIME_ZONE as mentioned in this document. I will suggest you to verify if you have define WEBSITE_TIME_ZONE to adjusted for time changes in the specific timezone, including daylight saving time and changes in standard time.

If you have already set the WEBSITE_TIME_ZONE then it could be missed trigger as mentioned here.
By default TimerTrigger keeps track of executions by keeping track of execution history in storage, ensuring that schedules can be maintained in the face of process crashes or node restarts. It uses this history to "catch up" on missed schedule executions, if for some reason an occurrence was missed. You can disable that behavior if you wish by setting UseMonitor = false on your TimerTrigger attribute.