My Little Scripts - server-side-countdown-clock.asp

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SERVER-SIDE-COUNTDOWN-CLOCK.ASP

Just like countdown-clock.js, this script allows you to place countdown clocks on your web site. Unlike that one, whose computed time period depends on the settings of the visitor's computer, this script counts down to the server's date. It is very similar to countdown-clock.js, with the addition of a time differential factor: I use a mixture of JavaScript and ASP to find out the difference between the server and client dates, then I use that to synchronise things.

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);

         Today = new Date();
         Todays_Year = Today.getFullYear() - 2000;
         Todays_Month = Today.getMonth();

         <%
         time_of_day = time
         time_of_day = TimeValue(time_of_day)

         today = date
         today = DateValue(today)

         current_second = second(time_of_day)
         current_minute = minute(time_of_day)
         current_hour = hour(time_of_day)
         current_day = day(today)
         current_month = month(today)
         current_year = year(today)
         %>

         //Computes the time difference between the client computer and the server.
         Server_Date = (new Date(<%= current_year - 2000 %>, <%= current_month %>, <%= current_day %>,
                                 <%= current_hour %>, <%= current_minute %>, <%= current_second %>)).getTime();
         Todays_Date = (new Date(Todays_Year, Todays_Month, Today.getDate(),
                                 Today.getHours(), Today.getMinutes(), Today.getSeconds())).getTime();

         countdown(year, month, day, hour, minute, (Todays_Date - Server_Date), format);
         }

function countdown(year, month, day, hour, minute, time_difference, format)
         {
         Today = new Date();
         Todays_Year = Today.getFullYear() - 2000;
         Todays_Month = Today.getMonth() + 1;

         //Convert 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, day, hour, minute, 00)).getTime();

         //Find their difference, and convert that into seconds.
         //Taking into account the time differential between the client computer and the server.
         Time_Left = Math.round((Target_Date - Todays_Date + time_difference) / 1000);

         if(Time_Left < 0)
            Time_Left = 0;

         switch(format)
               {
               case 0:
                    //The simplest way to display the time left.
                    document.all.countdown.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 ='';

                    document.all.countdown.innerHTML = days + ' day' + dps + ' ';
                    document.all.countdown.innerHTML += hours + ' hour' + hps + ' ';
                    document.all.countdown.innerHTML += minutes + ' minute' + mps + ' and ';
                    document.all.countdown.innerHTML += seconds + ' second' + sps;
                    break;
               default:
                    document.all.countdown.innerHTML = Time_Left + ' seconds';
               }

         //Recursive call, keeps the clock ticking.
         setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' +
                     time_difference + ', ' + format + ');', 1000);
         }