After fixing the problems of the new date picker introduced in Sakai 10 with chrome and having considered the dicussion on the using-sakai mailing list, we considered that it would be great to let users input the dates on the input field of the new date picker.
i.e. "Within Assignments, we are not able to use text entry to input dates. Using the popup date picker is forced, the text box becomes grayed out. We've had lots of professors complaining about this, and this could be what Norman is referring to."
So the new solution won't gray out the input and it will allow users to introduce de date without needing to use the popup.