User:TheUltimateH4M/Countdown Timer JS

// *************************************** // * Code for the Halo 4 Countdown Timer * // * Template by User:Halo4master       * // * Code credit to its original author * // ***************************************   function updatetimer(i) { var now = new Date; var then = timers[i].eventdate; var diff = count = Math.floor((then.getTime - now.getTime) / 1000); // catch bad date strings if (isNaN(diff)) { timers[i].firstChild.nodeValue = '** ' + timers[i].eventdate + ' **'; return; }       // determine plus/minus if (diff < 0) { diff = -diff; var tpm = 'T plus '; } else { var tpm = 'T minus '; }       // calcuate the diff var left = (diff % 60) + ' seconds'; diff = Math.floor(diff / 60); if (diff > 0) left = (diff % 60) + ' minutes ' + left; diff = Math.floor(diff / 60); if (diff > 0) left = (diff % 24) + ' hours ' + left; diff = Math.floor(diff / 24); if (diff > 0) left = diff + ' days ' + left timers[i].firstChild.nodeValue = tpm + left; // a setInterval is more efficient, but calling setTimeout // makes errors break the script rather than infinitely recurse timeouts[i] = setTimeout('updatetimer(' + i + ')', 1000); }   function checktimers { //hide 'nocountdown' and show 'countdown' var nocountdowns = getElementsByClassName(document, 'span', 'nocountdown'); for (var i in nocountdowns) nocountdowns[i].style.display = 'none' var countdowns = getElementsByClassName(document, 'span', 'countdown'); for (var i in countdowns) countdowns[i].style.display = 'inline' //set up global objects timers and timeouts. timers = getElementsByClassName(document, 'span', 'countdowndate'); //global timeouts = new Array; // generic holder for the timeouts, global if (timers.length == 0) return; for (var i in timers) { timers[i].eventdate = new Date(timers[i].firstChild.nodeValue); updatetimer(i); //start it up       } }   addOnloadHook(checktimers); // End for Halo 4 Countdown code