My Little Scripts - countdown-clock.js - PHP ASP Scripts, JavaScript, HTML

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COUNTDOWN-CLOCK.JS

Allows you to place a countdown to any future date of your choice on your website. The one on this page is programmed to display the time left for christmas. I have only tested it on internet explorer 6, however, it should work on 5. the format of the pareters year, month, day, hour, minute is yy, mm, dd, hh, mm. Feel free to modify the functions to your own liking. The script currently gets its current date from the client, a truer way of implementing a countdown to any particular date would be to somehow obtain it from the server.

function countdown_clock(year, month, day, hour, minute, format)
         {
         //I chose a div as the container for the timer, but
         //it can be an input tag inside a form, or anything
         //who's displayed content can be changed through
         //client-side scripting.
         html_code = '<div id="countdown"></div>';
         
         document.write(html_code);
         
         countdown(year, month, day, hour, minute, format);                
         }
         
function countdown(year, month, day, hour, minute, format)
         {
         Today = new Date();
         Todays_Year = Today.getFullYear() - 2000;
         Todays_Month = Today.getMonth();                  
         
         //Convert both today's date and the target date into miliseconds.                           
         Todays_Date = (new Date(Todays_Year, Todays_Month, Today.getDate(), 
                                 Today.getHours(), Today.getMinutes(), Today.getSeconds())).getTime();                                 
         Target_Date = (new Date(year, month - 1, day, hour, minute, 00)).getTime();                  
         
         //Find their difference, and convert that into seconds.                  
         Time_Left = Math.round((Target_Date - Todays_Date) / 1000);
         
         if(Time_Left < 0)
            Time_Left = 0;
         
         var innerHTML = '';
         
         switch(format)
               {
               case 0:
                    //The simplest way to display the time left.
                    innerHTML = Time_Left + ' seconds';
                    break;
               case 1:
                    //More datailed.
                    days = Math.floor(Time_Left / (60 * 60 * 24));
                    Time_Left %= (60 * 60 * 24);
                    hours = Math.floor(Time_Left / (60 * 60));
                    Time_Left %= (60 * 60);
                    minutes = Math.floor(Time_Left / 60);
                    Time_Left %= 60;
                    seconds = Time_Left;
                    
                    dps = 's'; hps = 's'; mps = 's'; sps = 's';
                    //ps is short for plural suffix.
                    if(days == 1) dps ='';
                    if(hours == 1) hps ='';
                    if(minutes == 1) mps ='';
                    if(seconds == 1) sps ='';
                    
                    innerHTML = days + ' day' + dps + ' ';
                    innerHTML += hours + ' hour' + hps + ' ';
                    innerHTML += minutes + ' minute' + mps + ' and ';
                    innerHTML += seconds + ' second' + sps;
                    break;
               default: 
                    innerHTML = Time_Left + ' seconds';
               }                   
                    
            document.getElementById('countdown').innerHTML = innerHTML;     
               
         //Recursive call, keeps the clock ticking.
         setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + format + ');', 1000);
         }

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