Java時間操作（一）：關於UTC格式時間處理

Java中獲取形如:20160811T122132+08 格式，可以通過如下方法

package com.mc.others;

public class UTCTimeTest {
    @Test
    public void test1() {
        Calendar calendar = Calendar.getInstance();
        DateFormat dtf = new SimpleDateFormat("yyyyMMdd'T'HHmmssZ");
        Date now = calendar.getTime();
        String format = dtf.format(now);
        System.out.println(format);//20160803T222649+0800
    }
    @Test
    public void test2() {
        Date now = new Date();
        DateFormat dtf = new SimpleDateFormat("yyyyMMdd'T'HHmmssZZ");
        String format = dtf.format(now);
        System.out.println(format);//20160803T221641+0800
    }
    @Test
    public void test3() {
        // org.joda.time.DateTime;
        DateTime dateTime = new DateTime();
        String format = dateTime.toString();
        System.out.println(format);//2016-08-03T22:14:19.293+08:00
    }
    @Test
    public void test4() {
        DateTime dateTime = new DateTime();
        String format = dateTime.toString("yyyyMMdd'T'HHmmssZZ");//20160803T221822+08:00
        System.out.println(format);
    }
}