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 = '
'; 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; 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 + ',' + format + ');', 1000); }