Watching partitioned assets trigger a downstream Dag

The upstream sales_pipeline_v3 and downstream sales_report Dags from the previous exercise are deployed and ready to run. The sales pipeline runs every minute and emits a partitioned daily_sales event on every run, while the report only cares about the date; that's exactly what StartOfDayMapper is for. Time to watch them work together.

Follow these steps in order:

1. In the Dags view, activate sales_report first so it is ready to react when the asset event arrives.
2. Then activate sales_pipeline_v3; it runs every minute and emits a partitioned daily_sales event on each run.
3. Wait about a minute for sales_pipeline_v3 to complete — sales_report then triggers automatically from the asset event.
4. Open sales_report, go to the Runs tab, open the latest run, and find the Mapped Partition key at the top of the run details.

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What is the date format of Mapped Partition key?