@JsonFormat on Getter

 @Jsonformat is an annotation belong to package Jackson-databind

It is used on a Getter method to format how the Date instance is serialized.  By default, a Date instance is serialized as a number ref. to the begging of the time counting. 

As using @JsonFormat, the time output is formatted ref. to a default time-zone or a locale. Normally it is the GMT time zone.  

@Getter
@Setter
@AllArgsConstructor
@Builder
public class RoomReservation {
    private Long roomId;
    private Long guestId;
    private String roomName;
    private String roomNumber;
    private String firstName;
    private String lastName;

    @Getter(AccessLevel.NONE)
    private Date date;

    @JsonFormat(pattern = "yyyy-MM-dd", shape = JsonFormat.Shape.STRING, timezone = "Europe/Copenhagen")
    public Date getDate() {
        return date;
    }

}