Add birthday field to WooCommerce my account and admin user page

The following code will add (and save) a custom birthday field to

• My account - edit account
• Admin user page - profile

// Add field - my accountfunction action_woocommerce_edit_account_form() {       woocommerce_form_field( 'birthday_field', array(        'type'        => 'date',        'label'       => __( 'My Birth Date', 'woocommerce' ),        'placeholder' => __( 'Date of Birth', 'woocommerce' ),        'required'    => true,    ), get_user_meta( get_current_user_id(), 'birthday_field', true ));}add_action( 'woocommerce_edit_account_form', 'action_woocommerce_edit_account_form' );// Validate - my accountfunction action_woocommerce_save_account_details_errors( $args ){    if ( isset($_POST['birthday_field']) && empty($_POST['birthday_field']) ) {        $args->add( 'error', __( 'Please provide a birth date', 'woocommerce' ) );    }}add_action( 'woocommerce_save_account_details_errors','action_woocommerce_save_account_details_errors', 10, 1 );// Save - my accountfunction action_woocommerce_save_account_details( $user_id ) {      if( isset($_POST['birthday_field']) && ! empty($_POST['birthday_field']) ) {        update_user_meta( $user_id, 'birthday_field', sanitize_text_field($_POST['birthday_field']) );    }}add_action( 'woocommerce_save_account_details', 'action_woocommerce_save_account_details', 10, 1 );// Add field - adminfunction add_user_birtday_field( $user ) {    ?>        <h3><?php _e('Birthday','woocommerce' ); ?></h3>        <table class="form-table">            <tr>                <th><label for="birthday_field"><?php _e( 'Date of Birth', 'woocommerce' ); ?></label></th>                <td><input type="date" name="birthday_field" value="<?php echo esc_attr( get_the_author_meta( 'birthday_field', $user->ID )); ?>" class="regular-text" /></td>            </tr>        </table>        <br />    <?php}add_action( 'show_user_profile', 'add_user_birtday_field', 10, 1 );add_action( 'edit_user_profile', 'add_user_birtday_field', 10, 1 );// Save field - adminfunction save_user_birtday_field( $user_id ) {    if( ! empty($_POST['birthday_field']) ) {        update_user_meta( $user_id, 'birthday_field', sanitize_text_field( $_POST['birthday_field'] ) );    }}add_action( 'personal_options_update', 'save_user_birtday_field', 10, 1 );add_action( 'edit_user_profile_update', 'save_user_birtday_field', 10, 1 );