Shortcake UI

Please consider supporting Shortcake
https://github.com/wp-shortcake/shortcake/blob/master/README.md#screenshots

add_action( 'register_shortcode_ui', 'ccs_ui_today' );
function ccs_ui_today() {
    $shortcode_ui_args = array(
        'label' => esc_html__( 'Today', 'shortcode-ui-example' ),
        'listItemImage' => 'dashicons-calendar-alt',
        'attrs' => array(
            'label'       => esc_html__( 'Date format', 'shortcode-ui-example' ),
            'description' => esc_html__( 'For details, see the Codex: Formatting Date and Time.', 'shortcode-ui-example' ),
            'attr'        => 'format',
            'type'        => 'text',
            'meta'        => array(
                'placeholder' => get_option( 'date_format' ),
            ),
        ),
    );
    shortcode_ui_register_for_shortcode( 'today', $shortcode_ui_args );
}

https://wordpress.org/plugins/custom-content-shortcode/