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index.html
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<!DOCTYPE HTML>
<html>
<script>
var siteWidth = 1280;
var scale = screen.width /siteWidth;
document.querySelector('meta[name="viewport"]').setAttribute('content', 'width='+siteWidth+', initial-scale='+scale+'')
</script>
<head>
<link rel="stylesheet" href="countdown_style.css">
<meta name="viewport" content="width=1280, initial-scale=1">
<style>
p {
text-align: center;
font-size: 60px;
margin-top: 0px;
}
</style>
</head>
<body>
<center><h1 class = "header">Countdown</h1></center><br>
<div>
<p class = "timer" id="demo"></p>
<div class = "transbox">
<script>
// Set the date we're counting down to
var max_wrong = 5
var ClassHour = 0;
var ClassMinute = 0;
let am_pm = "";
function enterTime(){
ClassHour = 0;
ClassMinute = 0;
const ClassEnd = prompt("Countdown Till (i.e 3:50PM): ").trim();
am_pm = ClassEnd.slice(ClassEnd.length-2,ClassEnd.length).toUpperCase()
if(am_pm != "PM" && am_pm != "AM"){ //error: missing am/pm
window.location.reload();
}
var hour_end = 0
var minute_begin = 0
var col_found = false;
for(let i = 0; i < ClassEnd.length; i++){
if(ClassEnd[i] == ":"){
col_found = true;
if(i > 2){//error:hour is too long
window.location.reload();
}
hour_end = i;
minute_begin = i+1
}
}
if(!col_found){ //Error: missing colon
window.location.reload();
}
ClassHour = ClassEnd.slice(0,hour_end)
ClassMinute = ClassEnd.slice(minute_begin,minute_begin+2)
if(isNaN(ClassHour) || isNaN(ClassMinute)|| ClassEnd.length > 7 || ClassEnd.length < 6) {
window.location.reload();
}
if(parseInt(ClassHour) > 12 || parseInt(ClassMinute) > 59 || parseInt(ClassHour) == 0){
window.location.reload();
}
//convert to 24-hour time
if (am_pm == "PM"){ //PM
if(parseInt(ClassHour) == 12){ //12:00:00 PM is 12:00:00 (24-hour time)
ClassHour = 12;
}
else{
ClassHour = parseInt(ClassHour) + 12;
}
}
else{//AM
if(parseInt(ClassHour) == 12){//12:00:00 AM is 00:00:00 (24-hour time)
ClassHour = 0;
}
ClassHour = parseInt(ClassHour); //if in the am, 12 hour is the same as 24 hour
}
ClassMinute = parseInt(ClassMinute)
}
enterTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get today's date and time
var now = new Date();
var currHour = now.getHours();
var currMinute = now.getMinutes();
var currSecond = now.getSeconds();
// Time calculations for hours, minutes and seconds
var hours = ClassHour - currHour;
var minutes = ClassMinute - currMinute;
var seconds = 59 - currSecond;
if(ClassHour < currHour){
if(hours < -15){
hours = hours-1;
}
hours += 24;
if (minutes < 0 ){
minutes = 59 + minutes;
}
else{
minutes = minutes;
}
}
// If the count down is over, write some text
if (hours == 0 && minutes == 0 && seconds == 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "Congrats";
}
if(hours == 0 ){
hours += 24;
if(minutes > 0 ){
hours -=24;
}
if(minutes < 0){
hours--;
minutes = 59 + minutes;
}
else{
minutes = minutes;
}
}
else if(hours == 0 && minutes < 0){
hours += 12;
}
else if(minutes < 0 && hours != 0){
hours--;
minutes = 59 + minutes;
}
// Output the result in an element with id="demo"
if(hours >= 10){
if(minutes >= 10){
if(seconds >= 10){
document.getElementById("demo").innerHTML = hours + "h" + ":" + minutes + "m" + '<sub> ' +seconds + "s" + '</sub>';
}
else{
document.getElementById("demo").innerHTML = hours + "h" + ":" + minutes + "m" + '<sub> ' + "0" + seconds + "s" + '</sub>';
}
}
else{
if(seconds >= 10){
document.getElementById("demo").innerHTML = hours + "h" + ":0" + minutes + "m" + '<sub> ' +seconds + "s" + '</sub>';
}
else{
document.getElementById("demo").innerHTML = hours + "h" + ":0" + minutes + "m" + '<sub> ' + "0" + seconds + "s" + '</sub>';
}
}
}
else{
if(minutes >= 10){
if(seconds >= 10){
document.getElementById("demo").innerHTML = "0" + hours + "h" + ":" + minutes + "m" + '<sub> ' +seconds + "s" + '</sub>';
}
else{
document.getElementById("demo").innerHTML = "0" +hours + "h" + ":" + minutes + "m" + '<sub> ' + "0" + seconds + "s" + '</sub>';
}
}
else{
if(seconds >= 10){
document.getElementById("demo").innerHTML = "0" + hours + "h" + ":0" + minutes + "m" + '<sub> ' +seconds + "s" + '</sub>';
}
else{
document.getElementById("demo").innerHTML = "0" +hours + "h" + ":0" + minutes + "m" + '<sub> ' + "0" + seconds + "s" + '</sub>';
}
}
}
}, 1000);
</script>
</div>
<center><a onclick = "window.location.reload()" class = "refresh">Refresh</a></center><br>
<p class = "sig"> <a class = "github" href = "https://github.com/yotham" target = "_blank">Yotham Sage</a></p>
</body>
</html>