class DateUtils {

    public static Date getStartOfDay(Date inputDay) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(inputDay);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    private  DateUtils();

}