public class FormatDateTime {

public static void main(String[] args) {
SimpleDateFormat myFmt=new SimpleDateFormat("yyyy年MM月dd日 HH時mm分ss秒");
SimpleDateFormat myFmt1=new SimpleDateFormat("yy/MM/dd HH:mm"); 
SimpleDateFormat myFmt2=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//等價於now.toLocaleString()
SimpleDateFormat myFmt3=new
 
 SimpleDateFormat("yyyy年MM月dd日 HH時mm分ss秒 E ");
SimpleDateFormat myFmt4=new SimpleDateFormat(
"一年中的第 D 天 一年中第w個星期 一月中第W個星期 在一天中k時 z時區");
Date now=new Date();
System.out.println(myFmt.format(now));
System.out.println(myFmt1.format(now));
System.out.println(myFmt2.format(now));
System.out.println(myFmt3.format(now));
System.out.println(myFmt4.format(now));
System.out.println(now.toGMTString());
System.out.println(now.toLocaleString());
System.out.println(now.toString());
} 
}

SimpleDateFormat sdf 
 
= new SimpleDateFormat();String d = sdf.format(Date date);Date d = sdf.parse(String sourse);