Multi-Day External Meeting Invites Showing Incorrect Days To Recipient

We are having an odd issue in our Exchange 2010 (SP3) environment with multi-day external meeting requests coming in with the wrong days. This does occur not
with internal meeting requests of the same day and time settings.
As you can see below, one of our external partners is sending a meeting request that is to occur
Monday, Tuesday, Wednesday, Thursday, and Friday from 10:30 AM to 11:00 AM, but when users in our system receive it, Outlook is saying it is scheduled
Sunday and Monday 10:30 AM to 11:00 AM.
I have checked to ensure the time and date are correct on all of our Exchange servers and the clients experincing the issue. Looking at the invite in OWA also yields the same results.
I also had another external partner send a similar invite and got the same results, so I know it is not isolated to the one external domain.
Google searches have turned up nothing with this particular issue, mostly people having time zone descrpencies, and iOS specific bugs.
Has anyone seen this before and know what we can do to fix it?
Please let me know if I can provide any further information about our environment that would help track this down.

We are having the exact same issue. We are running 2010 SP2 RU6. Multi-day meetings such as Monday, Wednesday and Friday show up as Sunday and Monday when sent to us by an outside Exchange environment. This cannot be replicated internally obviously.
Time is correct and Time Zone settings on our DC's and Exchange are fine. Also I'd like to note we are using IronPorts with ESMTP as our smart hosts.

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    2) There's DateFormat key in it, change it to "EEE H:mm", save the file.
    3) Now Cmd-I (right click - Get info) on that file in Finder, and check option named "Locked" ("Защита").
    System Preferences' Date & Time pane sets the aforementioned DateFormat to "ccc H:mm" when you tick the "Show the day of the week" option, while in Russian locale. And in English it becomes "EEE H:mm". The problem is that Sys.pref and even SystemUIServer (that shows the menu) processes somehow do not like the former value and erase it. After every relaunch of SystemUIServer (after reboot or being killed) tries to change "EEE" to "ccc" again (which would be cleared to nothing next time), that is why you have to lock the plist file.

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