setting time format in docker compose

[H4nsie]

I may need some help with setting the time-format. As the readme tells: ' If you want to set a specific format use e.g. --timeformat '%a %d %b %Y %T' '. Seems that I cannot use quotes or spaces is the parameters?

docker-compose.yml
- ADDITIONAL_PARAMETERS=--convert-times --timeformat '%a %d %b %Y %T' --prefix weconnect
gives error:
weconnect-mqtt: error: unrecognized arguments: %T'

Tried escaping the quotes, double quotes but with no luck.
Only thing that will work is using %a%d%b%Y%T without quotes and without spaces, but that messes up my time string.

Anyone an idea?