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private final int interval;
        private Calendar calendar;

        public Clock(int interval) {
            this.interval = interval;
        }

        public long getCurrentInterval() {
            Calendar currentCalendar = this.calendar;

            if (currentCalendar == null) {
                currentCalendar = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC"));
            }

            return (currentCalendar.getTimeInMillis() / 1000) / this.interval;
        }

        public void setCalendar(Calendar calendar) {
            this.calendar = calendar;
        }