将当前日期时间插入自定义wordpress日期时间列

I have an issue with inserting current datetime to custom wordpress datetime column. I've used curent_time function I also used date('Y-m-d H:m:s') as value for the column but it did not work.

I will provide my code for any suggestions:

global $wpdb;
$load_rec_table = $wpdb->prefix.'load_rec';
// Insert into load record table
$wpdb->insert($load_rec_table,array(
    'rec_date' => current_time('mysql'),
    'total_load' => $_POST['totalPower'],
    'total_gap' => $_POST['totalGap'],
    'carriage' => $_POST['carriage']
    ));

You can use NOW() or CURRENT_TIMESTAMP() functions of Mysql

global $wpdb;
$load_rec_table = $wpdb->prefix.'load_rec';
// Insert into load record table
$wpdb->insert($load_rec_table,array(
    'rec_date' => NOW(),
    'total_load' => $_POST['totalPower'],
    'total_gap' => $_POST['totalGap'],
    'carriage' => $_POST['carriage']
    ));