Hi @reinhardgut,
sorry for the late reply!
Here is a small piece of my docker-compose.yml
to start Grafana (together with InfluxDB and Telegraf).
grafana:
image: grafana/grafana
container_name: grafana
restart: always
environment:
- GF_DATE_FORMATS_USE_BROWSER_LOCALE=true
...
That was all that was needed for me to have properly formatted date and time captions.