We’re testing a possible enhancement to core RT with anew extension
that modifies the Date: display in RT’s ticket history.
We’ve seen that some mail servers (particularly some versions of
Microsoft Exchange) are now sending all emails with timestamps in
UTC. This can be very confusing for users since RT will display that an
email was received in the user’s timezone, but then display an email
Date header many hours “off” from the user’s view. This has always been
true when someone from New York sent email to an RT used by a user in
Los Angeles, but the forced shift to UTC makes this even more
noticeable.
Here is a standard RT display of such an email.

That same email with the extension enabled:

If you’ve noticed this display issue in your RT, give the
RT::Extension::LocalDateHeader
extension a try on your RT installation.
Bugs can be reported to bug-RT-Extension-LocalDateHeader [at] rt.cpan.org
and we take pull requests at github.