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https://issues.apache.org/jira/browse/AIRFLOW-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16943362#comment-16943362
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jack commented on AIRFLOW-5394:
-------------------------------
Cron validation was introduced in [https://github.com/apache/airflow/pull/3698]
by [~xddeng]
> Invalid schedule interval issues
> --------------------------------
>
> Key: AIRFLOW-5394
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5394
> Project: Apache Airflow
> Issue Type: Bug
> Components: DagRun, scheduler
> Affects Versions: 1.10.2
> Reporter: Shreyash hisariya
> Priority: Major
>
> I am facing issues with using schedule interval of Airflow. Since there is no
> documentation at all, it took me few days to find that the cron expression
> accepts only 5 or 6 fields.
> Even with 5 or 6 fields, the dag is failing at multiple times.
> *For example : Invalid Cron expression: [0 15 10 * * ?] is not acceptable*
> The above cron is valid but the airflow doesn't accept it.
> # Can you please put up a documentation of what is valid and what not is
> valid?
> # Why does airflow doesn't take more than 6 fields?
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