RocketChat/Rocket.Chat

export function timeAgo(dateParam: number, locale: string): string {
    const int = new Intl.RelativeTimeFormat(locale, { style: 'long' });

    const date = new Date(dateParam).getTime();
    const today = new Date().getTime();
    const seconds = Math.round((date - today) / 1000);
    const minutes = Math.round(seconds / 60);
    const hours = Math.round(minutes / 60);
    const days = Math.round(hours / 24);
    const weeks = Math.round(days / 7);

    const months = new Date(date).getMonth() - new Date().getMonth();

    const years = new Date(date).getFullYear() - new Date().getFullYear();

    if (Math.abs(seconds) < 60) {
        return int.format(seconds, 'seconds');
    }

    if (Math.abs(minutes) < 60) {
        return int.format(minutes, 'minutes');
    }

    if (Math.abs(hours) < 24) {
        return int.format(hours, 'hours');
    }

    if (Math.abs(days) < 7) {
        return int.format(days, 'days');
    }

    if (Math.abs(weeks) < 4) {
        return int.format(weeks, 'weeks');
    }

    if (Math.abs(months) < 12) {
        return int.format(months, 'months');
    }

    return int.format(years, 'years');
}