LC_TIME
is the entry regarding how the time is viewed in your system. So if you want to change permanently your time locale from english, to let's say, italian, all you have to do is the following:
sudo update-locale LC_TIME=it_IT.UTF-8
if an error show up like *** update-locale: Error: invalid locale settings
, this means that you don't have that specific locale into your system and you have to generate it with the following command (this one is for french language):
sudo locale-gen fr_FR.UTF-8
after that, repeat the first command
All you have to do now is to log-out and log-in again
If you're unclear of which locale to use, by doing cat /usr/share/i18n/SUPPORTED
will list you all available supported locales onto your system
Cheers!