function plural(num, unit) {
    num = Math.floor(num);
    return num + " " + unit + (num === 1 ? "" : "s");
}

export function ago(date) {
    const now = new Date();
    const diff = now - date;
    if (diff < 1000) {
        return "just now";
    }
    if (diff < 60 * 1000) {
        return plural(diff / 1000, "second") + " ago";
    }
    if (diff < 60 * 60 * 1000) {
        return plural(diff / (60 * 1000), "minute") + " ago";
    }
    if (diff < 24 * 60 * 60 * 1000) {
        return plural(diff / (60 * 60 * 1000), "hour") + " ago";
    }
    if (diff < 7 * 24 * 60 * 60 * 1000) {
        return plural(diff / (24 * 60 * 60 * 1000), "day") + " ago";
    }
    return date.toLocaleDateString();
}