[plt-scheme] how to work with dates in scheme

From: Geoffrey S. Knauth (geoff at knauth.org)
Date: Fri Dec 19 21:05:53 EST 2008

On Dec 19, 2008, at 15:01, Sigrid Keydana wrote:
> could anyone please give me a starting point how to work with dates in
> scheme (apart from the PLT scheme reference, where I did not find  
> what I
> was looking for)?

As John Clements wrote, srfi-19 will help.  I found conflicts between  
PLT dates and srfi-19 dates, so in my code I've been using an s19:  
prefix, e.g.:

#lang scheme
(require (prefix-in s19: (lib "srfi/19.ss")))
(printf "~a: Alles Gute im neuen Jahr!\n"
          (s19:make-date 0 0 0 0 1 1 2009 (* -5 3600))

→ 01.01.2009: Alles Gute im neuen Jahr!

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