> Native OS datepickers do not exist on the desktop: not in the browser, not anywhere else, unless you count the Windows clock dialog.

Their existence is why this is such a popular browser feature request:

http://msdn.microsoft.com/en-us/library/system.windows.contr...

https://developer.apple.com/library/mac/documentation/Cocoa/...

https://developer.gnome.org/gtk3/stable/GtkCalendar.html