Debian 11 - wrong calendar language

[mikhairu]

I installed Debian 11 Gnome. Everything is Ok, except for the language in the Calendar (at top middle of screen).
In Settings > Region and Language, Language is English and Formats is set to United States. However, my timezone is +07 (Bangkok, Thailand) and I suspect because of this my calendar uses Thai language.

How can I fix this so that English language is used?

[mikhairu]

The "locale" command was showing properties whose values were either "en_US.UTF-8" or "th_TH.UTF-8". Updating /etc/default/locale file did not help.

I ended up reinstalling the system - during the installation I chose New York / US as my timezone location. After the install I updated my timezone to the actual location and things are working fine now.

[mm3100]

I would suspect it is region setting that is causing those issues. Even if you pick english as language some parts might be localized according to region.