Mongoose date format

Currently having an issue retrieving dates from mongoose. This is my schema:

var ActivitySchema = new Schema({
    activityName      : String
  , acitivtyParticipant  : String
  , activityType  : String
  , activityDate      : { type: Date, default: Date.now }
  , activityPoint  : Number
});

This defaults to use "mm.dd.yyyy", so all data I have which is in format "dd.mm.yyyy" defaults to Date.now.

Does anyone know if there is a "format: "dd.mm.yyyy" function which I can put directly in the Schema? Any other ideas? (would really not like to update all the data)

Thank you for any replies