i'll make date selector like this picture, but when i search for the forge i only find web version, and i need for mobile version. Any recommendation for mobile version?
The default date picker should work fine on mobile.
As Joao indicate, it is best to use the standard date picker from Outsystems mobile to enter a date.
You must specify the Entity Attribute date type as date, after that you can add an input field in the screen and assign it to the newly created entity attribute with the data type date.