function todayhours_load_widget() {
    register_widget( 'todayhours_widget' );
}
add_action( 'widgets_init', 'todayhours_load_widget' );

// Creating the widget
class todayhours_widget extends WP_Widget {

function __construct() {
parent::__construct(

// Base ID of your widget
'todayhours_widget',

// Widget name will appear in UI
__('Today Hours', 'todayhours_widget_domain'),

// Widget description
array( 'description' => __( 'Display today\'s business hours', 'todayhours_widget_domain' ), )
);
}

// Creating widget front-end

public function widget( $args, $instance ) {
$title = apply_filters( 'widget_title', $instance['title'] );

// before and after widget arguments are defined by themes
echo $args['before_widget'];
if ( ! empty( $title ) )
echo $args['before_title'] . $title . $args['after_title'];

// This is where you run the code and display the output

switch (date("w")) {
    // w = day of week, 0 = sunday, 6 = saturday
    case 0:
        $d = "Closed";
        break;
    case 1:
        $d = "9:00am - 12:00pm, 2:00pm - 6:00pm";
        break;
    case 2:
        $d = "2:00pm - 6:00pm";
        break;
    case 3:
        $d = "9:00am - 12:00pm, 2:00pm - 6:00pm";
        break;
    case 4:
        $d = "Closed";
        break;
    case 5:
        $d = "9:00am - 1:00pm";
        break;
    case 6:
        $d = "Closed";
        break;
}
echo __( $d, 'todayhours_widget_domain' );
echo $args['after_widget'];
}

// Widget Backend
public function form( $instance ) {
if ( isset( $instance[ 'title' ] ) ) {
$title = $instance[ 'title' ];
}
else {
$title = __( 'New title', 'todayhours_widget_domain' );
}
// Widget admin form
?>
<p>
<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
</p>
<?php
}

// Updating widget replacing old instances with new
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
return $instance;
}
} // Class wpb_widget ends here