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Add custom shortcode in contact form 7

wpcf7_add_shortcode('custom_date', 'wpcf7_custom_date_shortcode_handler', true);

function wpcf7_custom_date_shortcode_handler($tag) {
    if (!is_array($tag)) return '';

    $name = $tag['name'];
    if (empty($name)) return '';

    $next_week = date('Y-m-d', time() + (60*60*24*7)); 
    $html = '<input type="hidden" name="' . $name . '" value="' . $next_week . '" />';
    return $html;
}

Source: stackoverflow.com

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