@Sachin_Arora_ Tried by deleting existing date property and checked.. It is not getting saved.. And still shows same error. There was no version upgrade recently.

Hello,Using Aem 6.4.8, when trying to modify/save/add any page property it is throwing following error org.apache.sling.api.resource PersistanceException :Invalid Date.Anyone faced similar issue before?  -Thanks in advance