In srfi 19, there is convenience format directives for various ISO 8601
date/time formats. i.e.

     ~2     ISO-8601 time+zone, `~k:~M:~S~z'
     ~3     ISO-8601 time, `~k:~M:~S'
     ~4     ISO-8601 date/time+zone, `~Y-~m-~dT~k:~M:~S~z'
     ~5     ISO-8601 date/time, `~Y-~m-~dT~k:~M:~S'

However, ~k is incorrect here, as iso 8601 specifies that hours have two
digits (i.e. 9am is "09") which means the ~H directive.

Funnily enough, if you look in srfi-19.scm itself you even see

(define iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z")

note, the ~H.

I've attached a patch to fix these.
     
-- 
Ian Price -- shift-reset.com

"Programming is like pinball. The reward for doing it well is
the opportunity to do it again" - from "The Wizardy Compiled"