validate birthdate field

[sibelius]

should it possible to validate if birthdate was filled properly before accepting it?

[rickdroio]

try this snippet:

add_action('woocommerce_checkout_process', 'validadeCheckoutFields');

function validadeCheckoutFields() {
    $billing_birthdate = filter_input(INPUT_POST, 'billing_birthdate');

    if (strlen(trim(preg_replace('/^(0[1-9]|[12][0-9]|3[01])[\/](0[1-9]|1[012])[\/](19|20)\d\d$/', '', $billing_birthdate))) > 0) {
        wc_add_notice(__('Data de Nascimento inválido (DD/MM/AAAA)'), 'error');
    }
}