Integration of Consented at in Email Marketing

I'm encountering an issue with integrating the timestamp in Klaviyo using the new API:
 

The date-time field appears to be passed correctly, but Klaviyo displays only the current date without the exact time. Example:

• Activity details: Timestamped at 2024-10-30T00:00:00Z and recorded on 2024-10-30T07:08:55Z.

I've tried multiple date functions, including gmdate("Y-m-d\TH:i:s\Z"), (new DateTime("now", new DateTimeZone("UTC")))->format("Y-m-d\TH:i:s\Z"), and (new DateTime("now", new DateTimeZone("UTC")))->format("c"). However, I keep receiving the error: "Historical email subscription does not have a valid consented_at timestamp" — despite passing "historical_import" => true as required.

Interestingly, if I hardcode the date with a timestamp like "2023-10-30T07:16:47Z", the data passes without issues.

Since I’ve been using Klaviyo integrations for years without this issue, I believe it may relate to recent API updates. Any insights on how to ensure the exact time is passed and recorded accurately? Thank you!

API Endpoint: https://a.klaviyo.com/api/profile-subscription-bulk-create-jobs/

$requestData['data'] = [
    "type" => "profile-subscription-bulk-create-job",
    "attributes" => [
        "profiles" => [
            "data" => [
                [
                    "type" => "profile",
                    "attributes" => [
                        "email" => $email,
                        "subscriptions" => [
                            "email" => [
                                "marketing" => [
                                    "consent" => "SUBSCRIBED",
                                    "consented_at" => date("Y-m-d")
                                ]
                            ]
                        ]
                    ]
                ]
            ]
        ],
        "historical_import" => true
    ],
    "relationships" => [
        "list" => [
            "data" => [
                "type" => "list",
                "id" => $listId
            ]
        ]
    ]
];