76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
// Causes html elements in the 'relativedate' class to be displayed
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// as relative dates. The date is parsed from the title attribute, or from
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// the element content.
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var dateElements;
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hook("onload", getDates);
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function getDates() {
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dateElements = getElementsByClass('relativedate');
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for (var i = 0; i < dateElements.length; i++) {
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var elt = dateElements[i];
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var title = elt.attributes.title;
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var d = new Date(title ? title.value : elt.innerHTML);
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if (! isNaN(d)) {
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dateElements[i].date=d;
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elt.title=elt.innerHTML;
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}
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}
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showDates();
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}
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function showDates() {
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for (var i = 0; i < dateElements.length; i++) {
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var elt = dateElements[i];
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var d = elt.date;
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if (! isNaN(d)) {
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elt.innerHTML=relativeDate(d);
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}
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}
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setTimeout(showDates,30000); // keep updating every 30s
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}
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var timeUnits = [
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{ unit: 'year', seconds: 60 * 60 * 24 * 364 },
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{ unit: 'month', seconds: 60 * 60 * 24 * 30 },
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{ unit: 'day', seconds: 60 * 60 * 24 },
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{ unit: 'hour', seconds: 60 * 60 },
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{ unit: 'minute', seconds: 60 },
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];
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function relativeDate(date) {
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var now = new Date();
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var offset = date.getTime() - now.getTime();
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var seconds = Math.round(Math.abs(offset) / 1000);
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// hack to avoid reading just in the future if there is a minor
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// amount of clock slip
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if (offset >= 0 && seconds < 30 * 60 * 60) {
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return "just now";
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}
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var ret = "";
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var shown = 0;
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for (i = 0; i < timeUnits.length; i++) {
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if (seconds >= timeUnits[i].seconds) {
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var num = Math.floor(seconds / timeUnits[i].seconds);
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seconds -= num * timeUnits[i].seconds;
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if (ret)
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ret += "and ";
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ret += num + " " + timeUnits[i].unit + (num > 1 ? "s" : "") + " ";
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if (++shown == 2)
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break;
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}
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else if (shown)
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break;
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}
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if (! ret)
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ret = "less than a minute "
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return ret + (offset < 0 ? "ago" : "from now");
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}
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