Geb should have a module for datetime-local inputs. See [specification in HTML 5.2](https://www.w3.org/TR/2017/REC-html52-20171214/sec-forms.html#local-date-and-time-state-typedatetimelocal) or [documentation at W3Schools](https://www.w3schools.com/tags/att_input_type_datetime-local.asp).
Geb should have a module for datetime-local inputs. See specification in HTML 5.2 or documentation at W3Schools.