到目前为止，欧洲格式的wp_query

I'm trying to query some posts between 2 dates, look like it's not working because my posts are not int YYYYMMDD format but in european format DD.MM.YYYY

  $args = array(
  'orderby' => 'meta_value',
  'meta_key' => 'usp-custom-rdvp_date_event_start',
  "order" => "ASC",
  'meta_query' => array(
      array(
        'key'     => 'usp-custom-rdvp_date_event_start',
        'value'   => array( $fromDate, $toDate ),
        'type'    => 'DATE',
        'compare' => 'BETWEEN',
      ),
  ),
);

Did you have a hack to query between 2 European date?

PS. I can't change the date format

You can easily change the date format with some array manipulation:

$mydate = 'DD.MM.YYYY';
echo implode( '', array_reverse( explode('.', $mydate) ) ); # Output: YYYYMMDD

You may also find a better way using the DateTime class.

$date_str = '02.04.2016';
$myDateTime = DateTime::createFromFormat( 'd.m.Y', $date_str );
echo $myDateTime->format( 'Ymd' ); # Output: 20160402