To me, it appears that the “before” and “after” short tags are only working on {event_endtime}, if the setting “Show end date” is set to “Always show end date” and not set to “Only show end date, if different from start date”. faebu, can you confirm?
In my template, I use {event_enddate; before=” bis “}. For events with different start and end date, the additional “bis” does only show up with the setting “Always show end date”.
Kind regards