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

*Parameters*

`datePattern`::
The date format. Refer to the https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/time/format/DateTimeFormatter.html[`DateTimeFormatter` documentation] for the syntax. If `null`, the function returns `null`.

`dateString`::
Date expression as a string. If `null` or an empty string, the function returns `null`.