As I upgraded my Grafana from 8.3.3 to 8.4.1, it understood the timestamp without converting it to a string and then overriding the unit to DateTime.
With this change, each bar got a label like “12/02 00:01”, which already was acceptable for me.
After looking in the grafana.ini, i found out that it automatically uses the format interval_hour = MM/DD HH:mm. Sadly I did not find out, how to change the bar chart to use another format.
So i chose a not-so-elegant approach and just changed the format in the config to interval_hour = dddd which displays the week day (src: momentjs.com). Since no other graph uses this format in my dashboards, this was an OK solution.
This is the final result:
And also thanks for the hint with template variables!
Greetings,
Florian