Java时间操作（一）：关于UTC格式时间处理

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);
}
}