如何将PHP DateTime序列化为JavaScript DateTime？

Question

I am using the Symfony Serializer Component to serialize some PHP objects to JSON. Among them are DateTime objects.

The JSON output I get for a PHP DateTime object is as follows:

{
    "lastErrors" : {
        "warning_count" : 0,
        "warnings" : [],
        "error_count" : 0,
        "errors" : []
    },
    "timezone" : {
        "name" : "UTC",
        "location" : {
            "country_code" : "??",
            "latitude" : 0,
            "longitude" : 0,
            "comments" : ""
        }
    },
    "offset" : 0,
    "timestamp" : 1416903372
}

To actually work with this object I need to convert the timestamp to a JS DateTime object. Also this will probably fail on some machines when the 32-bit timestap overflows in a few years.

How can I make the Symfony Serializer output PHP DateTime objects as JavaScript DateTime objects?