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<!DOCTYPE HTML>
<html>
<head>
<style>
p {
text-align: center;
font-size: 60px;
}
div {
font-family: "Courier";
text-align: center;
font-size: 60px;
color: #990000;
}
</style>
</head>
<body>
<div id="demo"></div>
<script>
var deadline = 0;
function checkfor(d) {
let now = new Date().getTime();
let ds = new Date().toDateString().substr(0, 17) + " " + d + ":00";
console.log("time string: " + ds);
let start = new Date(ds).getTime();
console.log("now: " + now);
if ((start > now) && ((start-now) < 1800000)) {
deadline = start;
console.log("set deadline to: " + ds);
} else {
console.log("skipping: " + ds);
}
}
checkfor("08:10");
checkfor("09:05");
checkfor("10:10");
checkfor("11:05");
checkfor("12:10");
checkfor("13:10");
checkfor("14:05");
checkfor("15:10");
checkfor("16:05");
checkfor("17:00");
checkfor("17:55");
checkfor("19:00");
checkfor("21:41");
checkfor("22:40");
checkfor("23:10");
var x = setInterval(function() {
let now = new Date().getTime();
let t = deadline - now;
if (t > 0) {
let days = Math.floor(t / (1000 * 60 * 60 * 24));
let hours = Math.floor((t%(1000 * 60 * 60 * 24))/(1000 * 60 * 60));
let minutes = Math.floor((t % (1000 * 60 * 60)) / (1000 * 60));
let seconds = Math.floor((t % (1000 * 60)) / 1000);
document.getElementById("demo").innerHTML
= ("00" + minutes).slice(-2) + ":" + ("00" + seconds).slice(-2);
} else {
document.getElementById("demo").innerHTML = "00:00";
}
}, 1000);
</script>
</body>
</html>
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