Hello,
Did you find a solution? Having similar trouble with this.
..
Just found the solution for my problem with date fields inside a repeater field.
Maybe this will help somebody else too:
'meta_query' => array(
array(
'key' => $repeater_date . '_%_date_time',
'value' => array( $min_date, $max_date ),
'compare' => 'BETWEEN',
'type' => 'DATE',
)
)