// This is generated by ESQL's AbstractFunctionTestCase. Do no edit it. See ../README.md for how to regenerate it.

*Parameters*

`datePart`::
Part of the date to extract.  Can be: `aligned_day_of_week_in_month`, `aligned_day_of_week_in_year`, `aligned_week_of_month`, `aligned_week_of_year`, `ampm_of_day`, `clock_hour_of_ampm`, `clock_hour_of_day`, `day_of_month`, `day_of_week`, `day_of_year`, `epoch_day`, `era`, `hour_of_ampm`, `hour_of_day`, `instant_seconds`, `micro_of_day`, `micro_of_second`, `milli_of_day`, `milli_of_second`, `minute_of_day`, `minute_of_hour`, `month_of_year`, `nano_of_day`, `nano_of_second`, `offset_seconds`, `proleptic_month`, `second_of_day`, `second_of_minute`, `year`, or `year_of_era`. Refer to https://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoField.html[java.time.temporal.ChronoField] for a description of these values.  If `null`, the function returns `null`.

`date`::
Date expression. If `null`, the function returns `null`.
