Add birthday field to WooCommerce my account and admin user page

Question

I have added the code below. The birthday field is showing in my account page and also in WP admin user page as well but the problem is that the date is not saving.

What I have so far

function iconic_get_account_fields() {
return apply_filters( 'iconic_account_fields', array(
    'user_url' => array(
        'type'        => 'date',
        'label'       => __( 'My Birth Date', 'iconic' ),
        'placeholder' => __( 'Date of Birth', 'iconic' ),
        'required'    => true,
    ),
) );
}
/**
* Add fields to registration form and account area.

*/
function iconic_print_user_frontend_fields() {
$fields = iconic_get_account_fields();

foreach ( $fields as $key => $field_args ) {
    woocommerce_form_field( $key, $field_args );
}
}
add_action( 'woocommerce_edit_account_form', 'iconic_print_user_frontend_fields', 10 ); // my account

 /**
 * Add fields to admin area.
 */
function iconic_print_user_admin_fields() {
$fields = iconic_get_account_fields();
?>
<h2><?php _e( 'Additional Information', 'iconic' ); ?></h2>
<table class="form-table" id="iconic-additional-information">
    <tbody>
    <?php foreach ( $fields as $key => $field_args ) { ?>
        <tr>
            <th>
                <label for="<?php echo $key; ?>"><?php echo $field_args['label']; ?></label>
            </th>
            <td>
                <?php $field_args['label'] = false; ?>
                <?php woocommerce_form_field( $key, $field_args ); ?>
            </td>
        </tr>
    <?php } ?>
    </tbody>
 </table>
 <?php
 }


 add_action( 'show_user_profile', 'iconic_print_user_admin_fields', 30 ); // admin: edit profile
 add_action( 'edit_user_profile', 'iconic_print_user_admin_fields', 30 ); // admin: edit other users

---

I use the code partly from:

The Ultimate Guide to Adding Custom WooCommerce Registration Fields

Answer 1

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

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

// Add field - my account
function 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 account
function 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 account
function 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 - admin
function 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 - admin
function 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 );