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Display full date in Thunderbird

I start Thunderbird with the following script:

#! /bin/bash
export LC_TIME=en_DK.utf8 && thunderbird "$@"

For emails sent or received today only the time is shown, e.g., 13:17.
For emails sent or received more than a week ago, the year, month, day and time are shown, e.g., 2018-06-13 07:43.

For emails sent and received a week after today only the year, month and time are shown, e.g., 2018/06 19:53.

How do I get Thunderbird to use the same format for dates/times more than a week old?

This problem appeared after upgrading from Jessie to Stretch with Thunderbird 52.8.0 in Stretch. I used in Jessie the same script quoted above, where all dates after today were 2017-03-28 23:19. (I do not remember which version of Thunderbird I had in Jessie.)

Regards, Ken