Feature Request/Idea: Show a string for the creation date and publication date of file

[ChengShi-1]

Overview of the Feature Request
The JS-dataverse would change the format of creation date and publication date, from Data object to String, so the frontend repo also need update.

What kind of user is the feature intended for?
(Example users roles: API User, Curator, Depositor, Guest, Superuser, Sysadmin)
All users

What inspired the request?
IQSS/dataverse-client-javascript#226

What existing behavior do you want changed?
All files and tests related to creation date and publication date of file would be changed

Any brand-new behavior do you want to add to Dataverse?
None

Any open or closed issues related to this feature request?
IQSS/dataverse-client-javascript#226