显示当前时间:    java.util.Data;类


	
data.toString() 的显示格式为：Thu May 09 20:55:45 CST 2019
	
	

	
SimpleDateFormatSimpleDateFormat()的format()方法显示详细时间
	
	

	
指定输出格式:simpleDateFormat("yyyy-MM-dd HH:mm:ss");     输出为： 2019-05-09 20:55:45
	
	

	
SimpleDateFormat详细内容
	
package www.javaExperiment;

import  java.util.Date;
import java.text.SimpleDateFormat;

/**
 * 显示当前时间
 */

public class ClassExperiment {
    public static void main(String[] args) {
        DateDisplay();
        Date date = new Date();
        System.out.println("\nThe current Time is: " + date.toString());
    }

    public static void DateDisplay() {
        Date date = new Date();
        SimpleDateFormat simpleDateFormat =
                new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println("Normal Type Date time is: " +
                simpleDateFormat.format(date));
    }
}



 

GMT显示当前时间
long totalMilliseconds = System.currentTimeMillis(); //1970年1月1日午夜到现在总毫秒数
long currentSecond = totalMilliseconds / 1000 % 60;
long currentMinute = totalMilliseconds / 1000 /60 % 60;
long currentHour = totalMilliseconds / 1000 /60 / 60 % 24;
System.out.println("Current time is" + currentHour + ":" + currentMinute + ":" + currentSecond + "GMT");

作为一名刚刚接触java的大一小白，用c的思想写了一个java代码来显示当前的时间，用currentTimeMills函数获取总共的毫秒数，又通过一系列的计算显示出当前的时间。如有错误，请各位大神指正。
public class Programme {

 public static void main(String[] args) {
  long mills=System.currentTimeMillis();//获取总共的毫秒数
  Programme programme=new Programme();
  programme.current(mills);
 }
 public void current(long mills) {
  mills/=1000;
  long day=mills/(24*60*60);
  long hour=(mills-day*24*60*60)/3600;
  long min=(mills-day*24*60*60-hour*3600)/60;
  long second=mills-day*24*60*60-hour*3600-min*60;
  hour+=8;//我们比格林尼治快8小时
  
  long t;int i;
  for(i=1970;;i++) {
   t=day;
   if(leap(i)) {
    day-=366;
   }
   else {
    day-=365;
   }
   if(day<0) {
    break;
   }
  }
  
  t++;//这是格林威治的时间，我们与其相差8小时，t表示整的天数，但现在其实是第t+1天
  int year=i;
  long today=0;
  for(i=1;i<13;i++) {
   today=t;
   if(i==1||i==3||i==5||i==7||i==8||i==10||i==12) {
    t-=31;
   }
   else if(i==4||i==6||i==9||i==11) {
    t-=30;
   }
   else if(i==2&&leap(year)) {
    t-=29;
   }
   else {
    t-=28;
   }
   if(t<0) {
    break;
   }   
  }
  
  int month=i;
  String m="";
  switch(month) {
  case 1:
   m="January";break;
  case 2:
   m="February";break;
  case 3:
   m="May";break;
  case 4:
   m="April";break;
  case 5:
   m="May";break;
  case 6:
   m="Jun";break;
  case 7:
   m="July";break;
  case 8:
   m="August";break;
  case 9:
   m="September";break;
  case 10:
   m="October";break;
  case 11:
   m="November";break;
  case 12:
   m="December";break;  
  }
  System.out.println("Current time is "+today+" "+m+" "+hour+":"+min+":"+second);
 }
 
 public boolean leap(int year) {
  if(((year%4==0)&&(year%100!=0))||(year%400==0)) {
   return true;
  }
  else {
   return false;
  }
 }
}

放在页首里:
var enabled = 0; today = new Date();
var day; var date;
if(today.getDay()==0) day = "星期日 "
if(today.getDay()==1) day = "星期一 "
if(today.getDay()==2) day = "星期二 "
if(today.getDay()==3) day = "星期三 "
if(today.getDay()==4) day = "星期四 "
if(today.getDay()==5) day = "星期五 "
if(today.getDay()==6) day = "星期六 "
document.fgColor = " FF0072";
date1 =(today.getYear()) + "年" + (today.getMonth() + 1 ) + "月" + today.getDate() + "日 " ;
date2 = day ;
document.write(date1.fontsize(2));
document.write(date2.fontsize(2));
document.write("");
var now,hours,minutes,seconds,timeValue;
function showtime(){
now = new Date();
hours = now.getHours();
minutes = now.getMinutes();
seconds = now.getSeconds();
timeValue = (hours >= 12) ? "下午 " : "上午 ";
timeValue += hours+ ":";
timeValue += ((minutes < 10) ? "0" : "") + minutes + ":";
timeValue += ((seconds < 10) ? "0" : "") + seconds + "";
clock.innerHTML = timeValue;
setTimeout("showtime()",100);
}
showtime();
posted on 2008-04-04 17:18 冰枫逸范 阅读(1518) 评论(1)  编辑  收藏  所属分类: 博客技巧