@daq,

Could you post the exact date and time specification of the message (you may want to use some "view source" option or similar).

"18:00 UTC (0000)" doesn't seem to be a valid timestamp.

You should have something like this in the message header:
Date: Thu, 15 Mar 2012 06:59:49 +0100

In any case, even though RFC2822 says the time *should* be local time, it should also include a time zone specification, which means that any conforming e-mail client should also be able to handle that.

In that sense, if what you say is correct, the e-mail client on the N9 is working correctly, but the receiving client is not, so there's no reason why the N9 client should be patched.