How do you find out the date you joined facebook

Type in your mail service search box "Facebook Registration Confirmation" that is if you don't delete these mails. Got my result on the date the confirmation link was sent by Facebook team.

Facebook Registration Confirmation


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show details 11/12/07

Hey Kaxxxx,

You recently registered for Facebook using this email address. To complete your registration, follow the link below:
http://www.facebook.com/c.php?code=xxxxx&rt=2&email=kamaxxxxx%40gmail.com
(If clicking on the link doesn't work, try copying and pasting it into your browser.)

If you did not register for Facebook, please disregard this message.
Please contact info@facebook.com with any questions.

Thanks,
The Facebook Team