Since the update to Thunderbird 60.0, dates are getting the wrong format. Like
this:

   On 22/09/2018 03.36, xxx wrote:

It is doing "day/month/year  hour.minute", instead of what it was doing on the
previous version:  "year-month-day  hour:minute".

There is a new setting under Settings,  Advanced, general: use application
language or regional locale (English (Denmark)). But it is ignored.


My locale is this:

cer@Legolas:~> locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME=en_DK.UTF-8    <=======
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=es_ES@euro
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE=es_ES@euro
LC_MEASUREMENT=es_ES@euro
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
cer@Legolas:~> 


It is ignoring the setting, which was working previously.