Use date HTML5 input type for DateAttribute
From #5910 (closed)
The hard decision is whether to replace our date input by the type=date HTML5 input. Here is the support matrix: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date#Browser_compatibility
All major browsers seem to support it, and I expect most of them will have a better interface than our old fashion datepicker. It would mean switching from d.m.Y to YYYY-MM-DD format for POST value. We may keep d.m.Y as internal value to avoid confusing webservice and internal code (but I do think YYYY-MM-DD is a better and more widely used format).
I think we should migrate DateAttribute to HTML5 and to
YYYY-MM-DD internal format. It may break external tools relying on the webservice.
It could break some internal features but this seems unlikely.
I think we should drop the JS datepicker entirely.
This should be done in a major release, so either %FusionDirectory 1.4 or 1.5.