Profile: ioannisM-2

Problem: I would like to use datepickers to set a date range to filter my View

Solution: Views' native date range filters do not utilize datepickers. Instead, they utilize multiple select boxes to set individual date elements, like day, month, year, etc. If you want to use datepickers, you must implement a custom date field in your post type. This field must be automatically updated the first time a post is published. Then this custom field can be used as a date range filter with datepicker style controls.

The following code should be placed in functions.php:

function copy_custom_date_field_on_publish ( $post_id ) {
  // only copy over the publish date on original maintenance-issue posts
  $status = get_post_status( $post_id );
  $pubdate = get_post_meta( $post_id, 'wpcf-issue-date', true);
  if ( $status != 'publish' || $pubdate )
    return;
  $pubdate = get_the_date( 'U', $post_id );
  update_post_meta( $post_id, 'wpcf-issue-date', $pubdate, '' );
}
add_action( 'save_post', 'copy_custom_date_field_on_publish', 1000 );

Relevant Documentation: https://codex.wordpress.org/Plugin_API/Action_Reference/save_post