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I have an issue when sharing the calendar of my group and subscribing in Apple's iCal on my Mac: all-day events (single-day or several-day events) all start a day earlier and end a day too soon vs. what I have set on the groups.io backend. Time zones are the same in entry and on the global setting below the calendar view on the right (UTC+1, Amsterdam, Berlin...).
What am I doing wrong? Any help is highly appreciated!

This is most likely a bug so I'd suggest emailing support.
Also, you could download the feed.ics file and open in a text editor to see what start/end times are published in it.
Toby


Looks like this:

Thanks for the advice!
Did just that and here it is: "DTSTART:20181220" is not the right date (see screenshot below).
Interestingly, "DTEND:20190101" is correct although in iCal the entry ends a day earlier...