protected String addDateStartPostfix(String dateString) {
        if (TStringUtils.isBlank(dateString)) {
            return null;
        }

        return dateString + " 00:00:00";
    }
When the time is queried, the start time is 00:00:00

@param dateString    the string date value
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/web/common/BaseResult.java