incorrect birthday saved to phonebook using Contacts Plugin

We are facing an issue while trying to add birthday to Contact while using Cordova for android while adding a new contact to the phonebook

following is part of the code

contact = navigator.contacts.create({
"displayName": displayname
});

// store contact name
var contactName = new ContactName();
contactName.familyName = lastname;
contactName.givenName = firstname
contact.name = contactName;

contact.birthday = new Date("16 May 1984");

// save the contact
contact.save();
With above code, when data is viewed in android phone, the birthday is save as 29-12-6731 instead of expected 16-May-1984

we have tried all possible combinations of date entry viz: 16-May-1984 ; 16/May/1984 ; 16/5/1984 ; new date(1984,05,16)

but all in vain the results are the same.

also need to know how to save anniversary date

when using this plugin for IOS, the date saved is 15-May-1984 (1 day less than expected).