Year wrong for January next Year

[DefCon-CC]

Steps to reproduce

1. Open Calendar App in Browser
2. Forward Month to January

Expected behaviour

Shall display January 2022 between the "Forward and Backward Buttons"

Actual behaviour

Displays January 2021 between the "Forward and Backward Buttons"

Server configuration

Operating system: RHEL8

Web server: Apache

Database: MySQL

PHP version: 7.4.23

ownCloud version: 10.8.0 (stable)

Calendar version: 1.6.4

Updated from an older installed version or fresh install: Update

Signing status (ownCloud 9.0 and above):

Login as admin user into your cloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

No errors have been found.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your instance's installation folder

ownCloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your instance's installation folder

or 

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: yes, WebDAV sometimes

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your instance's installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Be sure to replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser: Firefox 93.0

Operating system: Win7

CalDAV-clients:

Logs

Web server error log

Insert your webserver log here

Log file (data/owncloud.log)

Insert your ownCloud.log file here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...