order of date column in custom post type

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I have a custom post type and trying to set custom columns, the date column is there by default, and it appears right after the title. Do I have to unset the date first and then re-apply it, or is there a more elegant way of achieving this: 

function custom_columns($columns) {
    unset( $columns['date'] );

    $columns = array_merge($columns, array(
        'title'     => 'Alert Title',
        'region'    => 'Region',
        'date'      => 'Date',
        ) 
    );

    return $columns;
}
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  1. That’s the only thing there is to do: array manipulation.

    The filter manage_edit-CPT_columns is fired in class-wp-list-table.php:

    add_filter( "manage_{$this->screen->id}_columns", array( &$this, 'get_columns' ), 0 );

    Which in turn dispatches the function get_columns() in the sub-class class-wp-posts-list-table.php.

    And, inside it, one filter for taxonomies, and others for post/page/cpt columns.
    And all of them dealing with array elements.
    Maybe a one line solution exists with some PHP function, but two lines is valid code too.