LocalDate givenDate = LocalDate.parse("2019-04-23",DateTimeFormatter.ofPattern("yyyy-MM-dd"));

        LocalDateTime startOfDay = givenDate.atTime(0,0,1);

        LocalDateTime endOfDay = givenDate.atTime(23,59,59);

        System.out.println(givenDate);

        System.out.println(givenDate.plusDays(1));

        System.out.println(startOfDay);

        System.out.println(endOfDay);

        Date fromDate = Date.from(startOfDay.atZone(ZoneId.systemDefault()).toInstant());

        Date toDate = Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());

        System.out.println(fromDate);

        System.out.println(toDate);