datetime.ts

import { _, ngettext } from './i18n';

export function timeago(date: string) {
    const TZdate = (new Date(date)).getTime();
    const maxLength: {[key:string]: number} = { second: 60, minute: 60, hour: 24, day: 7, week: 4.35, month: 12, year: 10000 };
    let val, inTheFuture;
    if (Date.now() >= TZdate) {
        val = (Date.now() - TZdate) / 1000;
        inTheFuture = false;
    } else {
        val = (TZdate - Date.now()) / 1000;
        inTheFuture = true;
    }

    for (const unit in maxLength) {
        if (Math.floor(val / maxLength[unit]) === 0) {
            const result = Math.floor(val);
            switch (unit) {
                case "year":
                    return inTheFuture ? ngettext("in %1 year", "in %1 years", result) : ngettext("%1 year ago", "%1 years ago", result);
                case "month":
                    return inTheFuture ? ngettext("in %1 month", "in %1 months", result) : ngettext("%1 month ago", "%1 months ago", result);
                case "week":
                    return inTheFuture ? ngettext("in %1 week", "in %1 weeks", result) : ngettext("%1 week ago", "%1 weeks ago", result);
                case "day":
                    return inTheFuture ? ngettext("in %1 day", "in %1 days", result) : ngettext("%1 day ago", "%1 days ago", result);
                case "hour":
                    return inTheFuture ? ngettext("in %1 hour", "in %1 hours", result) : ngettext("%1 hour ago", "%1 hours ago", result);
                case "minute":
                    return inTheFuture ? ngettext("in %1 minute", "in %1 minutes", result) : ngettext("%1 minute ago", "%1 minutes ago", result);
                case "second":
                    return inTheFuture ? ngettext("in %1 second", "in %1 seconds", result) : ngettext("%1 second ago", "%1 seconds ago", result);
            }
        }
        val = val / maxLength[unit];
    }
    return '';
}

export function renderTimeago() {
    const els = document.getElementsByTagName("info-date");
    Array.from(els).forEach((el) => {el.innerHTML = timeago(el.getAttribute('timestamp') ?? "unknown when");});
    setTimeout(renderTimeago, 1200);
}