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Assuming you are using the default Full version of Xfinity Connect, check the time settings in your computer operating system.
OK then try this---------
Change over to the Lite version of Xfinity Connect from the default Full version. To do so, from the Inbox page, go to Preferences>>>>>General>>>>>>>>>Version. Make the change. Hit the Back button, and then click on Email. Then click on "Timezones" and put in whatever is correct for you. Then you can go back to the Full version if you want to.
Sign completely out of Comcast and then back in again. See if that makes the change take.