Validation for ui.date_input and ui.time_input

[Mick235711]

Due to the underlying nature of ui.input, currently ui.date_input and ui.time_input do not do any validation; the date/time picker itself will only ever populate ISO-formatted date and time into the input field, but the user can essentially input anything themselves. The API of these two classes also does not expose a validation param at all, which ui.input does, making programming validation with them a bit hard.

Is it possible to add a validation param to their API, or maybe do automatic validation such that the callback is only called if and only if the user input can be parsed correctly?