时间

LocalDateTime获取当天的开始时间和结束时间

LocalDateTime today_start = LocalDateTime.of(LocalDate.now(), LocalTime.MIN);//获取当天开始时间
LocalDateTime today_end = LocalDateTime.of(LocalDate.now(), LocalTime.MAX);//获取当天结束时间

LocalDateTime和Date相互转换

    //LocalDate -> Date
    public static Date asDate(LocalDate localDate) {
        return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
    }

    //LocalDateTime -> Date
    public static Date asDate(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }

    //Date -> LocalDate
    public static LocalDate asLocalDate(Date date) {
        return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();
    }

    //Date -> LocalDateTime
    public static LocalDateTime asLocalDateTime(Date date) {
        return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();
    }