1、用DateTimeFormatter转换一个LocalDateTime类型

import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;public class TestDate1 {    public static void main(String[] args) {        //Get current date time        LocalDateTime now = LocalDateTime.now();        System.out.println("Before : " + now);        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");        String formatDateTime = now.format(formatter);        System.out.println("After : " + formatDateTime);          }}

Before : 2016-11-09T11:44:44.797After  : 2016-11-09 11:44:44

2、String转LocalDateTime

import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;public class TestDate2 {    public static void main(String[] args) {        String now = "2016-11-09 10:30";        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");        LocalDateTime formatDateTime = LocalDateTime.parse(now, formatter);        System.out.println("Before : " + now);        System.out.println("After : " + formatDateTime);        System.out.println("After : " + formatDateTime.format(formatter));    }}

Before : 2016-11-09 10:30After : 2016-11-09T10:30After : 2016-11-09 10:30

3、timestamp转localDateTime

Timestamp time = new Timestamp(LocalDateTime.now());LocalDateTime startTime = time.toLocalDateTime();

4、long类型转timestamp类型

Timestamp time = new Timestamp((long)1525607567619);