I can´t seem to enable the event time (eg. 17:00-19:00 next to the event title), what might be the problem here?

Well, I assumed in month view and weeks view people might not need exact time, (Mirror is too small to display many things), So I disabled it by default.
Add this to your css/custom.css

div.CALEXT div.tableStyle div.eventContainer div.eventTime {
  display:block;
} 

This is from a while ago but I am running into a problem. I would also like to add time stamps to my month view. I have add the recommended code to the end of my custom.css file but the time stamps still do not appear. Should be code refer to the “month” view somewhere?