My Mac Pro 2009 has the wrong time

I have an early 2009 Mac Pro 2.66GHz quad core Xeon processor, 20 GB RAM 2TB HD and a second 2TB HD for backup. Running OS 10.10.2. I have Parallels installed.
Starting with 10.9, I noticed that sometimes the clock was wrong. After the installation of 10.10, it seemed to get worse, although that may be unrelated. I have not seen my exact symptoms described in any posts related to this subject. Here is what I see:
I notice the time is wrong. It is never wrong by a certain number of hours. It can be off by 4 hours and 19 minutes and the next time 7 hours and 12 minutes. The day, however is usually correct. If I open the Date and Time control panel, the "Set date and time automatically" is checked and the Apple US server is chosen. The time is wrong. If I uncheck and then re-check the SD&TA checkbox, the time then corrects. However, a few minutes to hours later, the time will be wrong again. If I leave the Date and Time control panel open, the correct time seems to persist longer but eventually the time goes rogue. I even tried setting the time manually, turning off SD&TA and leaving the machine on without sleeping and it still became corrupted.
I have tried the following
Obviously, set the time and date automatically
Adjusting the time zones
Rebooting
Doing an NVRAM reset
Resetting the SMC
Reinstalling the OS (10.10)
Replacing the battery on the motherboard. When I removed the battery, I tested it and it was fine. I checked the position of the battery and it appears to be correct. It is the correct type of battery and fits perfectly into the slot. Just to be sure, I replaced it again.
Hitting it with a hammer (not really)
I saw some posts relating to the time zone being a problem, but the time is not off by an hourly interval, so that seems less likely. The one thing I thought was that perhaps Parallels is causing some sort of problem, but I could find no posts.
The machine is still great after 6 year. I use it almost every day all day. While this problem is small, it has large consequences because my calendar is off and I'm missing meetings, the time on my emails is weird, my file creation times are off and anything related to time is corrupted. I'm facile with Unix so if the solution involves the command line, so be it. I've had macs since a Centris 650 back in the dark ages 20 years ago but this one has stumped me.
Thanks for any help.

You have done all the appropriate things.
There have been reports of odd bugs related to Date & Time when a group of non-standard settings was set (deliberately or "just because") in the "Language & Region" Preferences.
I recommend you actively change those settings to a standard setting (that you do NOT intend to keep, e.g. Europe --United Kingdom), save Changes, close the Preferences pane, then re-Open, change to a standard set of Preferences (that you DO Intend to keep, e.g., Americas -- United States) save changes, close the preference pane, then check and reset the date&time and test. [If I have guessed incorrectly about your location in the world, no offense was intended.]

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