[plt-scheme] date structures from email header field?

Quoting Matthew Flatt <mflatt at cs.utah.edu>:

> At Mon, 13 Jan 2003 12:25:33 -0500 (EST), dvanhorn at emba.uvm.edu wrote:
> > Has anyone written a procedure for constructing date structures given a 
> > string as found in IMAP message headers?  eg.  "Tue, 7 Jan 2003 14:31:46
> > -0500 (EST)"
> 
> The latest (lib "date.ss") --- in CVS, post v203 release --- supports
> this as the 'rfc2822 display format.
> 
> The current date is also now included in the "standard header" created
> by (lib "head.ss" "net").
> 
> Matthew

Unless I've misunderstood something, I still don't see how a date structure can
be constructed from an rfc2822 date string?

-d