No we don't have any specific clientlibs written out for date field. PFB the SS of the node properties.

We are using granite/ui/components/foundation/form/datepicker​Yes we are using it inside nested multifield.

We have used a Date Field in one of our component's dialog. When author selects a date and save the changes, it gets saved in jcr but whenever authors reopens the component dialog it doesn't displays the previously authored date. Tried inside multifield as well and found same behavior.AEM version - ...