how add date in Google Anlytics Parameters

I am trying to sync missing order in google analytics but I don’t now what should I passed in below code

$result['orders'][] = [
    'id' =>  $order->getIncrementId(),
    'affiliation' => $this->escapeJsQuote($this->_storeManager->getStore()->getFrontendName()),
    'revenue' => $order->getGrandTotal(),
    'tax' => $order->getTaxAmount(),
    'shipping' => $order->getShippingAmount(),
];