SimpleDateFormat dff = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
dff.setTimeZone(TimeZone.getTimeZone("GMT+08")); 
String ee = dff.format(new Date());

Calendar calendar = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("GMT+8"));
String rt = sdf.format(calendar.getTime());

public static String getLocalDatetimeString(String local) { 
  Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(local)); 
  cal.setTimeInMillis(Calendar.getInstance().getTimeInMillis()); 
  String date = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" + cal.get(Calendar.DAY_OF_MONTH); 
  String time = cal.get(Calendar.HOUR_OF_DAY) + ":" + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND); 
  return date + " " + time; 
} 

String tt = getLocalDatetimeString("GMT+8"); 

import java.sql.Time;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;


public class TimeTest {

  /**
   * @param args
   */
  public static void main(String[] args) {
    method1();
    method2();
    method3();
  }

  static void method1(){
    SimpleDateFormat dff = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    dff.setTimeZone(TimeZone.getTimeZone("GMT+08")); 
    String ee = dff.format(new Date());
    System.out.println("ee="+ee);
  }

  static void method2(){
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss");
    sdf.setTimeZone(TimeZone.getTimeZone("GMT+8"));
    String rt = sdf.format(calendar.getTime());
    System.out.println("TimeTest.method2() rt="+rt);
  }
  static void method3(){
    String local = "GMT+8";
    Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(local)); 
    cal.setTimeInMillis(Calendar.getInstance().getTimeInMillis()); 
    String date = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" + cal.get(Calendar.DAY_OF_MONTH); 
    String time = cal.get(Calendar.HOUR_OF_DAY) + ":" + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND); 
    System.out.println("TimeTest.method3() date="+date+",time="+time);
  }

}

URL url=new URL("http://www.bjtime.cn");//取得资源对象
    URLConnection uc=url.openConnection();//生成连接对象
    uc.connect(); //发出连接
    long ld=uc.getDate(); //取得网站日期时间
    Date date=new Date(ld); //转换为标准时间对象
    //分别取得时间中的小时，分钟和秒，并输出
    System.out.print(date.getHours()+"时"+date.getMinutes()+"分"+date.getSeconds()+"秒");

LocationManager locMan = (LocationManager) this.getSystemService(MainActivity.LOCATION_SERVICE);
//获取最近一次知道的时间
long networkTS = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getTime();

locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this); //获取当前时间

@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
long time = location.getTime();
Date date = new Date(time);
System.out.println(time + " NETWORK_PROVIDER " + date);
// System.out.println(STANDARD_TIME + " ");
}

/**
   * 
   * @param ts 形如yyyy-MM-dd hh:mm:ss
   * @param intervalTime long类型
   * @return String HH:mm:ss
   */
  @SuppressLint("SimpleDateFormat")
  public static String getTime(String ts,long intervalTime){
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    Timestamp t=null;
    String tt="";
      try {
      t = new Timestamp(format.parse(ts).getTime());
      long ss = t.getTime();
      long st = ss+intervalTime;
      tt= getTime(st);
    } catch (java.text.ParseException e) {
      e.printStackTrace();
    }
    return tt;
  }
  /**
   * @param mis
   * @return HH:mm:ss
   */
  @SuppressLint("SimpleDateFormat")
  public static String getTime(long mis){
    SimpleDateFormat dff = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String ee = dff.format(new Date(mis));
    return ee.substring(11);
  }