44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
'use strict';
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function formatRelativeTime(timeString) {
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if (!timeString) {
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return 'never';
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}
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const then = Date.parse(timeString);
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const now = Date.now();
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const difference = Math.abs(now - then) / 1000.0;
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const future = now < then;
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const descriptions = [
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[60, 'a few seconds', null],
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[60*2, 'a minute', null],
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[60*60, '% minutes', 60],
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[60*60*2, 'an hour', null],
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[60*60*24, '% hours', 60*60],
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[60*60*24*2, 'a day', null],
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[60*60*24*30.42, '% days', 60*60*24],
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[60*60*24*30.42*2, 'a month', null],
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[60*60*24*30.42*12, '% months', 60*60*24*30.42],
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[60*60*24*30.42*12*2, 'a year', null],
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[8640000000000000/*max*/, '% years', 60*60*24*30.42*12],
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];
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let text = null;
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for (let kv of descriptions) {
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const multiplier = kv[0];
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const template = kv[1];
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const divider = kv[2];
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if (difference < multiplier) {
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text = template.replace(/%/, Math.round(difference / divider));
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break;
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}
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}
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if (text === 'a day') {
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return future ? 'tomorrow' : 'yesterday';
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}
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return future ? 'in ' + text : text + ' ago';
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}
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module.exports = {formatRelativeTime: formatRelativeTime};
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