Time Different Using Date Android

private String postTime(Date date) 
{
        long postTime = date.getTime();
        long atTime = System.currentTimeMillis();

        long diff = atTime - postTime;
        long sec = TimeUnit.SECONDS.convert(diff, TimeUnit.MILLISECONDS);
        if (sec >= 60) {
            long minit = TimeUnit.MINUTES.convert(diff, TimeUnit.MILLISECONDS);
            if (minit >= 60) {
                long hours = TimeUnit.HOURS.convert(diff, TimeUnit.MILLISECONDS);

                if (hours >= 24) {
                    long days = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
                    return days + " Days Ago";
                } else {
                    return hours + " Hours Ago";
                }
            } else {
                return minit + " Minutes Ago";
            }
        } else {
            return sec + " Secounds Ago";
        }
}