Time Machine: Mavericks backup date and time issues

Time Machine: Troubleshooting backup issues
re:  http://support.apple.com/kb/HT3275
"Messages you may see after clicking the red "i" include:"
I am getting a message not listed at this page. My Time Machine fails to backup to my USB3 Passport External Drive with the error code: 
"Time Machine couldn't complete the
backup to "2T PP".
The system date and time is incorrect."
I have the Date & Time preference set to:
"√ Set date and time automatically:  Apple Americas/U.S. (time.apple.com)"
and it seems to be the correct time.
The Language & Region prefs, advanced, Dates tab is set to defaults but I cannot get TM to backup and the same error occurs.
How can I remedy this?

Because you have just loaded a new operating system and a complete backup occurs is my understanding.

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