Java 日期时间操作

package com.webex.go;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.logging.SimpleFormatter;

public class TestDate {

public static void main(String[] args) {

long time=1308191767850l;
DateFormat sdf=new SimpleDateFormat("yyyy,MM,dd,hh:mm:ss");

//method 1
Calendar c1=Calendar.getInstance(TimeZone.getTimeZone("GMT"));
c1.setTimeInMillis(time);
System.out.println(c1.getTime()); //not show GMT8
System.out.println(c1.get(Calendar.HOUR));

//method 2
long mill=time-TimeZone.getDefault().getRawOffset();
Calendar c2=Calendar.getInstance();
c2.setTimeInMillis(mill);
System.out.println(sdf.format(c2.getTime()));
System.out.println(c2.get(Calendar.HOUR));


//method 3
System.out.println(sdf.format(new Date(mill)));


//to get japen time:method1
Calendar c_japen_1=Calendar.getInstance(TimeZone.getTimeZone("Japan"));
c_japen_1.setTimeInMillis(mill);
System.out.println(c_japen_1.getTime());
System.out.println("japen:"+c_japen_1.get(Calendar.HOUR));

//to get japen time:method2
GregorianCalendar c_japen_2=new GregorianCalendar(TimeZone.getTimeZone("Japan"));
c_japen_2.setTimeInMillis(mill);
System.out.println("japen:"+c_japen_2.get(Calendar.HOUR));


}

}


//Standard solution
long time=1308191767850l;
DateFormat sdf=new SimpleDateFormat("yyyy,MM,dd,hh:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println(sdf.format(new Date(time)));