Java8时间类使用方法

        LocalDateTime nowLocalDateTime = LocalDateTime.now();

        LocalDateTime startLocalDateTime;
        LocalDateTime endLocalDateTime;
// 今天的第0秒
                startLocalDateTime = nowLocalDateTime.with(LocalTime.MIN);
//今天的最后一秒
                endLocalDateTime = nowLocalDateTime.with(LocalTime.MAX);
                log.debug(startLocalDateTime + "---" + endLocalDateTime);
//这周的第0秒，从周一开始
                startLocalDateTime = nowLocalDateTime.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY)).with(LocalTime.MIN);
// 这周的最后一秒，从周日结束
                endLocalDateTime = nowLocalDateTime.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY)).with(LocalTime.MAX);
                log.debug(startLocalDateTime + "---" + endLocalDateTime);
//这个月的第一秒
                startLocalDateTime = nowLocalDateTime.with(TemporalAdjusters.firstDayOfMonth()).with(LocalTime.MIN);
//这个月的最后一秒
                endLocalDateTime = nowLocalDateTime.with(TemporalAdjusters.lastDayOfMonth()).with(LocalTime.MAX);
                log.debug(startLocalDateTime + "---" + endLocalDateTime);

createLocalDateTime.isAfter(startTime) && createLocalDateTime.isBefore(endTime)

LocalDateTime now= LocalDateTime.ofInstant(new Date().toInstant(), ZoneId.systemDefault());