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date_slide.html
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<script>
function get_utc() {
var date = new Date()
var userTimezoneOffset = date.getTimezoneOffset() * 60000;
return new Date(date.getTime() - userTimezoneOffset);
}
var first_date = new Date(2020, 11, 1, 9) // 1st of Dec 2020
// Use 9 AM to prevent issues with daytime saving.
var userTimezoneOffset = first_date.getTimezoneOffset() * 60000;
first_date = new Date(first_date.getTime() - userTimezoneOffset);
var now = get_utc()
//first_date = Date.parse(first_date.toUTCString().substr(0,30)+"+0000")
console.log(first_date)
function reset_slider() {
const diffWeeks = Math.ceil(Math.abs((now - first_date) / (1000 * 60 * 60 * 24)) / 7) - 1;
document.getElementById("date").setAttribute("max", diffWeeks);
console.log(diffWeeks)
slider_update()
}
function addWeeks(date, days) {
var result = new Date(date);
result.setDate(result.getDate() + days * 7);
return result;
}
function slider_update() {
var tmp_date = addWeeks(first_date, document.getElementById("date").value).toISOString().substring(0, 10);
document.getElementById("date").labels[0].innerHTML = tmp_date;
document.getElementById("map").src = "svgs/tags-" + (tmp_date) + ".svg";
}
</script>
<body onload="reset_slider()">
<input type="range" id="date" name="date" oninput="slider_update()" style="width: 800px" min="0">
<label for="date">Date</label>
<div>
<img id="map" src="happy.svg" width="100%" />
</div>
</body>