Fix quarter hour calculation

        Calendar nextQuarter = Calendar.getInstance();

        //  Set 1 second to ensure quarter-hour threshold passed.

        nextQuarter.set(Calendar.SECOND, 1);

        nextQuarter.set(Calendar.MILLISECOND, 0);

        int minute = nextQuarter.get(Calendar.MINUTE);

        nextQuarter.add(Calendar.MINUTE, 15 - (minute % 15));

        long alarmOnQuarterHour = nextQuarter.getTimeInMillis();

        if (0 >= (alarmOnQuarterHour - System.currentTimeMillis())

                || (alarmOnQuarterHour - System.currentTimeMillis()) > 901000) {

            Log.wtf("quarterly alarm calculation error");

        long now = System.currentTimeMillis();

        long delta = alarmOnQuarterHour - now;

        if (0 >= delta || delta > 901000) {

            Log.wtf("quarterly alarm calculation error: nextq hour = " + alarmOnQuarterHour

                    + " now = " + now + " delta = " + delta);

            // Something went wrong in the calculation, schedule something that is

            // about 15 minutes. Next time , it will align with the 15 minutes border.

            alarmOnQuarterHour = now + 901000;

        }

        return alarmOnQuarterHour;

    }