Hi,
As daylight-saving time ended in
the US today, I discovered that ABCL's interpretation of the CL spec
concerning the behavior of 'encode/decode-universal-time' around DST is
not the usual one.
The usual interpretation is that when an
explicit timezone is not supplied to these calls, DST is selected
automatically based on whether it would have been in force (under
certain assumptions, e.g., you're not in Arizona) at the time being
converted. ABCL's behavior is to convert the time based on whether DST
is in force at the time of the call.
I think it's pretty
clear that the former interpretation was the intended one, even if the
language of the spec is admittedly not as clear as it should have been.
SBCL does it that way, CCL does it that way, and I even dug out the
Genera 7.2 sources, which I still have lying around, to confirm that it
did it that way too.
It looks like the ABCL interpretation was more-or-less intentional since a comment in the code says "adapted from SBCL". Do the ABCL developers feel strongly that this is the correct behavior?