Q: iCal shows wrong date in dock icon post El Capitan upgrade

Finaleyes,

Remove Calendar from the Dock, and replace it with Calendar from the Applications Folder.

Finaleyes,

If you are familiar with using Terminal you could try using the command "killall Dock"

This is happening to me, also.  I found that I could use fast user switching to switch to a guest account, and when I switch back it's correct.

In System Preferences -> Users & Groups -> Login Options you can enable "Show fast user switching menu".  Then you can switch users without first logging out, and it will keep both user sessions active.

Same problem but the suggested fix didn't work.

OS X 10.11.3 Calendar 8.0 (2092.2) first account correct date shows in dock, fast user switch to second account, Jan 23. Follow suggestion, quit, remove from doc, add fresh Calendar from Applications folder, back to being Jan 23 for 2nd user and correct date Feb 12, 2016 for first user?!?

Any conspiracy theories on why Jan 23 is significant? Why not Friday the 13th or leap day?

p.s. I used the same apple id in both user accounts on our new iMac 5k.

Have the same issue after upgrading OS X 10.11.3 Calendar 8.0 (2092.2)

I noticed the date changes when I change List sort order in Language and Region, but it helps only once, the next day date freezes again

Anyone can advise where to dig to solve this?

All mentioned above help only for one day, then issue is repeating