Query regarding PostgreSQL date/time binary format for libpq

Hi,
   I am working on an application using PostgreSQL. I need to send date to PostgreSQL in binary format using the libpq interface. I have walked through the PostgreSQL code base, did find some reference to the date/time binary format but didn't get the exact format. To much code to digest in one parse :).
   Can you please provide me with any good reference to the exact binary format dbserver expect for date/time. I just can't use the text format :(. Any reference material, paper, web page or a mail specifying the exact binary date/time format will do.
 
Thanks in advance. I really appreciate your time.
 
regards,
Shoaib Naazir.

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