LocalDate startDate = LocalDate.now();
// +8是北京时间
Long minTime = LocalDateTime.of(startDate, LocalTime.MIN).toInstant(ZoneOffset.of("+8")).toEpochMilli();
Long maxTime = LocalDateTime.of(startDate, LocalTime.MAX).toInstant(ZoneOffset.of("+8")).toEpochMilli();
System.out.println(minTime);
System.out.println(maxTime);