Please note that the various "Received:" headers are the only ones that actually record the time in which an email is received/processed.

The date value that is instead presented to the user by their email clients (and unfortunately even to admins by Exchange...) is usually the value of the "Date" headers in the email. This "Date" header is controlled by the sender (the spammer) and can be modified to anything they wish.

Please note that there are some email clients that will instead default the "Received Date" display to the actual time the message was received by the client itself. These same email clients can usually be configured to display the "Received Date", which again is the date the email was received by the client, or they can be configured to display the "Sent Date", which matches the "Date" header as entered by the sender.

I'll be sending you shortly an email to the address you used to register in the forum having a future date of Sunday the 9th so you may see the difference.