II belive that in ISO8601 the date and time should be separated by a 'T', not a space

Based on http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations I believe the implementation ought to be changed to

iso8601DateFormat :: Maybe String -> String
iso8601DateFormat timeFmt =
    "%Y-%m-%d" ++ case timeFmt of
             Nothing  -> "" 
             Just fmt -> 'T' : fmt

Trac metadata

Trac field	Value
Version	6.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Blocking
CC
Operating system	Unknown
Architecture	Unknown