格林威治时间加上8h即为北京时间
本文以格林威治时间转为北京时间为例，若需将北京时间转为格林威治时间只需将文中+8改为-8即可
1. 时间格式为：-01-04T04:16:23.609Z
此处T为分隔符，Z为时区
package org.example;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;//时间格式为：-01-04T22:15:06.714Zpublic class Time {public static void test(String date) throws ParseException {//设置时间格式SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");//将输入时间转换为mssdf.parse(date).getTime();Calendar cal = Calendar.getInstance();cal.setTimeInMillis(sdf.parse(date).getTime());System.out.println("格林威治时间：" + cal.getTime());cal.add(Calendar.HOUR, +8);System.out.println("北京时间：" + cal.getTime());}public static void main(String[] args) throws ParseException {test("-01-04T04:16:23.609Z");}}
结果：
2. 时间格式为：-01-04 04:16:23.609
package org.example;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;//时间格式为：-01-04 22:15:06.714public class Time {public static void test(String date) throws ParseException {//设置时间格式SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");//将输入时间转换为mssdf.parse(date).getTime();Calendar cal = Calendar.getInstance();cal.setTimeInMillis(sdf.parse(date).getTime());System.out.println("格林威治时间：" + cal.getTime());cal.add(Calendar.HOUR, +8);System.out.println("北京时间：" + cal.getTime());}public static void main(String[] args) throws ParseException {test("-01-04 04:16:23.609");}}
结果：
3.当前时间
package org.example;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;//时间格式为：-01-04 22:15:06.714public class Time {public static void test() throws ParseException {Date nowTime = new Date();Calendar cal = Calendar.getInstance();cal.setTimeInMillis(nowTime .getTime());System.out.println("格林威治时间：" + cal.getTime());cal.add(Calendar.HOUR, +8);System.out.println("北京时间：" + cal.getTime());}public static void main(String[] args) throws ParseException {test();}}
结果：
