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I've also had this issue, and have implemented the "hardware fix" as described by DogP over on the Acura forum (Navi clock/ dash clock Sync MEGATHREAD (UPDATE:04-06 fixed!) - AcuraZine - Acura Enthusiast Community - waiting for the admins on their forum to let me in to thank him!).

I've made a GitHub page with some more info: GitHub - dsclee1/HondaSatNavClockFix: Hardware Fix for Honda Sat Navs with GN-80 Furuno GPS modules displaying the incorrect time

For anyone not interested in the hardware fix and happy to wait until August, it looks like around 17th August 2022 is the magic date that the clock will become adjustable again - but you'll probably need auto daylight savings turned off and to adjust it manually every 6 months.
 

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Here is a fix for owners of the West Europe White Disc 3.C0.

* Disclaimer *

I've installed this on my Sat Nav, but haven't fully tested that the clock works again. I currently have the hardmod installed, and to uninstall it would involve stripping out the dash and glove box to remove it, which I currently don't have the time to do. I'm pretty sure this should work, and I can verify that it didn't break my Sat Nav. However, do this at your own risk!

If you're the first one to try this and it works... congratulations, you're a pioneer!

What does it do?
For some reason Honda decided that 2003-01-01 is the beginning of time, and currently the Sat Nav clock is receiving times in 2002 (due to the GN-80 GPS module believing it's 2002 due to GPS week rollover). This patch changes Honda's beginning of time to 2002-01-01, which should mean the clock works again. - Well mostly, it won't adjust for DST as it will still think we're in a different month of the year.

Instructions
This will work with a CD-R/CD-RW/DVD-R/DVD-RW, personally I opted for the DVD-RW.
Copy the following files to a folder on your PC from the original Honda DVD:
A0000_00.MNG
PRG_INFO.MNG
UPDATE_APL.exe
UPDATE_APL_AVN_EU.exe
SMGA.bin
SMGA2.bin

Save "civicclock.txt" from the attachment as "civicclock.exe" in the same folder.
Run "civicclock.exe" - the SMGA.bin will be updated (check the timestamp has changed).
Delete "civicclock.exe".
Burn all the remaining files to a CD/DVD (on Windows make sure to use the "standard" mode and not the newer "USB like" mode).
Insert the new disc into the Sat Nav DVD drive. When you see the message about "Can't read disc" simultaneously hold down "Menu", "Map" and "Back" (the bottom left button that looks like an arrow looping back on itself).
On the diagnostic screen go to "Version".
Press the "Download" button, and wait until the disc is installed.
Once the system reboots you can remove the disc and put your original disc back in - and hopefully have a working dash clock!
 

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Great to hear that the fix is working for several of you! Sorry I haven't replied, I've been away on vacation.

The eventual hope is that the clock can be fully fixed by correcting the date in the Sat Nav. But this involves a significant code change, if it's even possible.

If you're having one hour rollback issues then make sure you have the daylight savings settings turned off in the menu. They won't work anymore as it still believes it's October 2002. You'll need to manually set your time offset.
 

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I'm trying to do this but it starts to download then it says Please check your disc. Then it doesn't work, anything I'm doing wrong. I had to uncheck the Read Only option in the SMGA file and the time stamp changed when I ran then civicclock.exe file.
View attachment 325199
View attachment 325197
There's a few reasons this can happen. As our disc drives are pretty old now they can commonly become unable to read certain discs as the laser unit degrades. Try using a different disc, preferably of a different type. e.g. if you're using a DVD-R then maybe try a DVD-RW, or a CD-R, or a CD-RW. Also, when writing the files make sure it's done on the minimum write speed available (usually 4x).
 
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