Changing system language corrupts date format

[Ahmet Aksoy]

ubuntu 18.04 (07.04.2018 updated)
my system language was turkish and i changed to english but calendar remained in Turkish (with wrong format)
please check screenshots

[Ahmet Aksoy (parduist)]

format is incorrect while system language is English

[Daniel van Vugt (vanvugt)]

Does the problem go away after you reboot?

[Ahmet Aksoy (parduist)]

No, still exist

[Sebastien Bacher (seb128)]

Could you include the output of the command "locale" on the system which is displaying the wrong format?

[Ahmet Aksoy (parduist)]

pisi@Pisi-U1804PC:~$ locale
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=tr_TR.UTF-8
LC_TIME=tr_TR.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=tr_TR.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=tr_TR.UTF-8
LC_NAME=tr_TR.UTF-8
LC_ADDRESS=tr_TR.UTF-8
LC_TELEPHONE=tr_TR.UTF-8
LC_MEASUREMENT=tr_TR.UTF-8
LC_IDENTIFICATION=tr_TR.UTF-8
LC_ALL=
pisi@Pisi-U1804PC:~$

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.