Ended up using the following that seems to do the trick, although it’s using “between” and not the exact time I preferred. This might be clarified in the Reactor documentation? Is there btw another way to accomplish the same? Just realized that to narrow the time gap I could use e.g. -90 and -89 offsets…
Update: I found good explanations from the documentation, the rationale why there isn’t an “at” operator, so @rigpapa, you might as well ignore this post…
I think you are right about the original logic, but what you are proposing is incorrect. If I’ve understood correctly, “after 90 minutes before sunrise” is interpreted as being true between midnight and sunrise + 90 minutes.