按日期将Mysql导出到CSV文件请求

Question

我有用于将mysql导出到csv的脚本php，如下所示：

<?php
/* vars for export */
// database record to be exported
$db_record = 'baa';
// optional where query
// $where = 'WHERE 1 ORDER BY 1';
// filename for export
$tanggal = date("d-m-Y", strtotime('NOW'));
//$csv_filename = 'backup_data_'.$db_record.'_'.date('Y-m-d').'.csv';
$csv_filename = 'backup_data_'.$db_record.'_'.$tanggal.'.csv';
// database variables
$hostname = "localhost";
$user = "root";
$password = "";
$database = "test";
$port = 3306;
$conn = mysqli_connect($hostname, $user, $password, $database, $port);
if (mysqli_connect_errno()) {
    die("Failed to connect to MySQL: " . mysqli_connect_error());
}
// create empty variable to be filled with export data
$csv_export = '';
// query to get data from database
$query = mysqli_query($conn, "SELECT FILE_NAME, SERVER_ID, SENT, RECEIVED, PACKET_LOST, AVG_RTT, MIN_RTT, MAX_RTT, INSERT_DATE, TRANS_DATE FROM baa WHERE (INSERT_DATE BETWEEN '2018-12-01 00:00:01' AND '2018-12-01 00:30:00') AND FILE_NAME='sabu.txt'");
$field = mysqli_field_count($conn);
// create line with field names
for($i = 0; $i < $field; $i++) {
    $csv_export.= mysqli_fetch_field_direct($query, $i)->name.';';
}
// newline (seems to work both on Linux & Windows servers)
$csv_export.= '
';
// loop through database query and fill export variable
while($row = mysqli_fetch_array($query)) {
    // create line with field values
    for($i = 0; $i < $field; $i++) {
        $csv_export.= '"'.$row[mysqli_fetch_field_direct($query, $i)->name].'";';
    }
    $csv_export.= '
';
}
// Export the data and prompt a csv file for download
header("Content-type: text/csv");
header("Content-Disposition: attachment; filename=".$csv_filename."");
echo($csv_export);

/*function outputCsv($fileName, $assocDataArray)
{
    ob_clean();
    header('Pragma: public');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Cache-Control: private', false);
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment;filename=' . $csv_filename);    
    if(isset($assocDataArray['0'])){
        $fp = fopen('/xampp/htdocs/backup', 'w');
        fputcsv($fp, array_keys($assocDataArray['0']));
        foreach($assocDataArray AS $values){
            fputcsv($fp, $values);
        }
        fclose($fp);
    }
    ob_flush();
}
*/

脚本正在工作，但是我必须这样设置日期：

$query = mysqli_query($conn, "SELECT FILE_NAME, SERVER_ID, SENT, RECEIVED, PACKET_LOST, AVG_RTT, MIN_RTT, MAX_RTT, INSERT_DATE, TRANS_DATE FROM baa WHERE (INSERT_DATE BETWEEN '2018-12-01 00:00:01' AND '2018-12-01 00:30:00') AND FILE_NAME='sabu.txt'");

我的数据是最新的（更新/小时）：

如何导出csv文件之类

日期1-7：导出到8

日期8-14：在14中导出

日期15-22：在23导出

日期23-月末：下个月1日导出

谢谢