日期转换

 public static void main(String[] args) {
        //日期格式化
        LocalDateTime dateTime = LocalDateTime.now();
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
        String time = dateTime.format(dtf);
        System.out.println(time);
        System.out.println("------------------Date==》LocalDateTime------------------");
        //获取当前时间
        Date date = new Date();
        //转成时间戳
        Instant instant = date.toInstant();
        //时间戳 + 时区
        //使用LocalDateTime 中 API
        LocalDateTime dateTime1 = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
        System.out.println(dateTime1);
        System.out.println("------------------LocalDateTime==》Date------------------");
        LocalDateTime dateTime2 = LocalDateTime.now();
        //获得LocalDateTime时间戳
        Instant instant1 = dateTime2.atZone(ZoneId.systemDefault()).toInstant();
        //使用Date中API
        Date from = Date.from(instant1);
        System.out.println(from);
    }