時間戳程式碼

protected static Format format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 
 public static void printSysProperties(){
     Properties props=System.getProperties(); 
     Iterator iter=props.keySet().iterator(); 
     while(iter.hasNext()){ 
     String key=(String)iter.next(); 
     System.out.println(key+" = "+ props.get(key)); 
     } 
 }
  
 /**
  * timeZoneOffset表示時區，如中國一般使用東八區，因此timeZoneOffset就是8
  * @param timeZoneOffset
  * @return
  */
 public String getFormatedDateString(int timeZoneOffset){
     if (timeZoneOffset > 13 || timeZoneOffset < -12) {
         timeZoneOffset = 0;
     }
     TimeZone timeZone;
     String[] ids = TimeZone.getAvailableIDs(timeZoneOffset * 60 * 60 * 1000);
     if (ids.length == 0) {
         // if no ids were returned, something is wrong. use default TimeZone
         timeZone = TimeZone.getDefault();
     } else {
         timeZone = new SimpleTimeZone(timeZoneOffset * 60 * 60 * 1000, ids[0]);
     }
  
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     sdf.setTimeZone(timeZone);
     return sdf.format(new Date());
 }
  
 public static String getFormatedDateString(String _timeZone){
     TimeZone timeZone = null;
     if(StringUtils.isEmpty(_timeZone)){
         timeZone = TimeZone.getDefault();
     }else{
         timeZone = TimeZone.getTimeZone(_timeZone);
     }
   
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日  HH時mm分ss秒");
     sdf.setTimeZone(timeZone);
     //TimeZone.setDefault(timeZone);
     return sdf.format(new Date());
}
 
 public static void main(String args[]){
     System.out.println(getFormatedDateString(""));
     System.out.println(getFormatedDateString("Asia/Shanghai"));
     System.out.println(getFormatedDateString("Japan"));
     System.out.println(getFormatedDateString("Europe/Madrid"));
     System.out.println(getFormatedDateString("GMT+8:00"));
  
     printSysProperties();
 }
 

1. java -Duser.timezone=Asia/Shanghai DateTest  

java -Duser.timezone=Asia/Shanghai DateTest

1. System.setProperty("user.timezone","Asia/Shanghai");  

System.setProperty("user.timezone","Asia/Shanghai");