Julien Cubizolles <j.cubizolles@free.fr> writes:

> 'gnus-search-transform seems to be at fault here. It uses
> '(format-time-string "%e-%b-%Y") where %b returns the "locale’s
> abbreviated month name" when imap commands expects the english abbreviated
> month name.

It's working with the attached patch. I'm not sure this is the best way
to go but I'm happy with it.