https://portal.uclaextension.edu/restricted/2026.1.19_2916/javascript/reservationConfirmationDelayedLoad.js

1var counter = setInterval(countdownTimer, 1000); // 1000 will run the method every second
2var globalSeconds = null;                        // Global seconds counter so we don't have to keep parsing the HTML element
3
4function countdownTimer() {
5  try {
6    var currentCounterValueElement = document.getElementById("countdownClockTimer");
7    
8    // Safety check in case the element in not on the page this JS file is included in
9    if(currentCounterValueElement == null) {
10      clearInterval(counter);
11      return;  
12    }
13    
14    if(globalSeconds == null) {
15      setGlobalSeconds(currentCounterValueElement);
16    }
17    
18    // If the count down is finished, remove the call to this method which occurs every second
19    if(globalSeconds == 0) {
20      clearInterval(counter);
21      return;
22    }
23
24    globalSeconds = globalSeconds - 1;
25    var newHours = Math.floor(globalSeconds / 3600);
26    var newMinutes = Math.floor((globalSeconds - (newHours * 3600)) / 60);
27    var newSeconds = globalSeconds - (newMinutes * 60) - (newHours * 3600);
28    
29    var formattedHours = ((newHours < 10 && newHours >=0) ? ("0" + newHours) : newHours);
30    var formattedMinutes = ((newMinutes < 10 && newMinutes >=0) ? ("0" + newMinutes) : newMinutes);
31    var formattedSeconds = ((newSeconds < 10 && newSeconds >=0) ? ("0" + newSeconds) : newSeconds);
32  
33    currentCounterValueElement.innerHTML = ((newHours > 0) ? formattedHours + ":" : "") + formattedMinutes + ":" +  formattedSeconds;
34  } catch(err) {
35    clearInterval(counter);
36    return;
37  }
38}
39
40function setGlobalSeconds(currentCounterValueElement) {
41  var counterComponents = currentCounterValueElement.innerHTML.split(":");
42  if(counterComponents.length == 2) {
43    // minutes and seconds
44    var minute = parseInt(counterComponents[0]);
45    globalSeconds = parseInt(counterComponents[1]) + (parseInt(minute) * 60);
46  } else if (counterComponents.length == 3) {
47    // hours, minutes and seconds
48    var hour = parseInt(counterComponents[0]);
49    var minute = parseInt(counterComponents[1]);
50    globalSeconds = parseInt(counterComponents[2]) + (parseInt(minute) * 60) + (parseInt(hour) * 3600);
51  }
52}