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@adactio
Last active September 11, 2023 05:10
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Periodically update the text of `datetime` elements with the relative time elapsed.
(function (win, doc) {
'use strict';
if (!doc.querySelectorAll || !win.Intl || !win.Intl.RelativeTimeFormat) {
// doesn't cut the mustard.
return;
}
var rtf = new Intl.RelativeTimeFormat('en', {
localeMatcher: 'best fit',
numeric: 'always',
style: 'long'
});
var units = {
'year' : 1000 * 24 * 60 * 60 * 365,
'month' : 1000 * 24 * 60 * 60 * (365/12),
'week' : 1000 * 24 * 60 * 60 * 7,
'day' : 1000 * 24 * 60 * 60,
'hour' : 1000 * 60 * 60,
'minute' : 1000 * 60,
'second' : 1000
};
var unit, then, now, diff, amount, text;
var updateDatetimes = function () {
now = Date.now();
doc.querySelectorAll('time[datetime]').forEach(function(timeElement) {
text = 'just now';
then = timeElement.getAttribute('datetime');
diff = new Date(then) - new Date(now);
for (unit in units) {
amount = units[unit];
if (Math.abs(diff) > amount) {
text = rtf.format(Math.round(diff / amount), unit);
break;
}
}
timeElement.innerText = text;
});
};
// Run the update every 30 seconds
setInterval(updateDatetimes, units.second * 30);
}(this, this.document));
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