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$error = 0;
            list($date, $time) = explode(' ', $_POST['date_till']);
            if (isset($date) && isset($time)) {
                list($day, $month, $year) = explode('.', $date);
                list($hour, $min) = explode(':', $time);
                if (isset($day) && isset($month) && isset($year) && isset($hour) && isset($min)) {
                    $date_till = "$year-$month-$day $hour:$min:00";
                    $executed = Groups::setOutOfRangeGroups($date_till);
                    if (!$executed) {echo 'q';
                        $error = 1;
                    }
                } else {echo 'w';
                    $error = 1;
                }
            } else {echo 'e';
                $error = 1;
            }