bug in PREFDATETIME

In the help section for "Index Format" under Setup Configuration, I see 
this option:

   PREFDATETIME
       This token represents the date and time at which the message was
       sent, according to the "Date" header field. It is the preferred
       date and time representation for the current locale. Internally it
       uses the %c version of the time from the strftime routine.

On my system (Ubuntu 9.10), I see this:

$ date +%c
Mon 03 May 2010 10:14:15 AM CDT

When I use PREFDATETIME in the Index Format, it does have that format, but 
every date begins with "Sun" (Sunday) instead of the correct day of the 
week.

If there is a bug list, I can submit there, but I don't know where that 
list is.

Mike