If you switch to a new folder, the date of the initially selected
message is taken from that mail (i.e. it looks like "Tue, 30 Mar 1999
09:38:11 +0200 (MEST)"). All the other messages have a
ctime()-formatted date (i.e. like "Sun May 2 04:28:38 1999").

The reason for that is that there are two different implementations
of dateStr() and both are used.

Probably only one implementation is better. That way, there´s a
single place where we can add new formats (e.g. ISO: yyyy-mm-dd
hh:mm).

Regards
 Daniel

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