// 参考： https://www.cnblogs.com/blog5277/p/6407463.html
public class DateTest {

    // 支持时分秒

    private static String LocalDateTimeTest(){

       LocalDateTime date = LocalDateTime.now();

       String res = date.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

       return res;

    }

    // 不支持时分秒

    private static String LocalDateTest(){

       LocalDate date = LocalDate.now();

       String res = date.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));

       return res;

    }

    // 时间戳

    private static long getTimestamp(){

        return Timestamp.valueOf(LocalDateTimeTest()).getTime();

    }

    public static void main (String[] args) {

       System.out.println(LocalDateTimeTest());

       System.out.println(LocalDateTest());

       System.out.println(getTimestamp(LocalDateTest()));

    }

}