How to upload image along with timestamp

Hi all,
I need to upload an image (byte array) and its timestamp to server which has jsp/servlet. But having trouble to transmit both in the same request.
In actionscript, I use URLRequest and URLLoader and upload the image without problem, however, I don't know how to upload the timestamp in the same request. I tried to build a ByteArray to contain both timestamp and the image, but I couldn't convert the Date.getTime() to byte[] correctly. The only function in ByteArray to input 8 bytes is writeDouble, but it doesn't embed the time correctly.
Where is the best way to handle this?
Thanks a lot

Thanks for the reply.
Can you shed some light how to transfer the file over? I use URLLoader with POST method and set the request data to a bytearray which is the image bitmapdata bit array. How do I send the the file name over? (parse the filename is not a problem)
Thanks,
Rovi

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