dimberman opened a new issue #7876: API endpoint to fetch DAG instance expected 
start time
URL: https://github.com/apache/airflow/issues/7876
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   "I'm looking for a mechanism to fetch a scheduled DAG instance's expected 
start time, in Oozie world it is populated as nominal time.
   For my specific use case, I have a DAG that is scheduled to run every 15 
mins and one of the task needs to use the DAG instance start time to query 
database and fetch all the rows that have been inserted/updated in last 15 
mins. I need a mechanism to fetch the expected start time of the DAG instance 
and pass it to the task since the task actual start time might be after the 
expected start time."
   **Use case / motivation**
   a mechanism to fetch a scheduled DAG instance's expected start time
   **Related Issues**
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