Question: I have the system default set to `en_US.UTF-8`. But (among other nonsensical things) this makes Sunday (a weekend day) the first day of the week in calendars.

I want to use the `LC_TIME` variable from `en_DK.UTF-8` while keeping the `en_US.UTF-8` variables for everything else.

I have generated both `en_US.UTF-8` and `en_DK.UTF-8` and I used to be able to simply edit `/etc/default/locale` by adding the line `LC_TIME="en_DK.UTF-8"`.

But this is no longer working and I have no idea why. So how can I get this working again?

Before people start telling me to hack on the `en_US.UTF-8` text file (at `/usr/share/i18n/locales`), this doesn't work either because updates periodically reset this. I want to know what the "proper" way of configuring for this is.

Answer: 
Here is what I would do:

1. check which locales are enabled:

```
grep -v '^#' /etc/locale.gen

```

You should at least get (Or something similar):

```
en_US.UTF-8 UTF-8

```
2. Enable it if it's not and disable unnecessary locales by commenting those lines.
3. generate locales:

```
sudo locale-gen

```
4. set default locales:

```
sudo localectl set-locale LANG=en_US.utf8 LC_TIME=en_DK.UTF-8

```
5. check All important files like: `.profile`, `.bashrc` and other startup files to make sure nothing is overwriting our configurations.

it should work.
Open `~/.profile` for editing and add this line:

```
export LC_TIME=en_DK.UTF-8

```

On Ubuntu GNOME you may also need to run this command:

```
gsettings reset org.gnome.system.locale region

```