How to get total posts count for each date?

Instead of the second loop, do the following:

1. Count the posts per date

2. Display them as you will

   // Count the posts per date
   $count = [];
   
   foreach ( $posts as $post ) {
   
       $date = get_the_date( 'Y-n-j', $post );
   
       $count[ $date ] =  ! isset( $count[ $date ] ) ? 1 : $count[ $date ] + 1;
   
   }