Created attachment 112262 [details]
Invitation generated by IBM Domino
The attached .ics file generated by IBM Domino / Lotus Notes describes an event starting at 2018-05-16T13:00:00 CEST (UTC+0200).
The rendered preview in KMail and the stored event in korganizer starts at 2018-05-16T14:00:00 CEST, one hour later.
The system timezone is set to Germany/Berlin (UTC+0200).
However I'm not sure if the file is incorrectly parsed by Korganizer or generated by Domino. I've checked an invitation I've imported one year ago with an earlier version of korganizer (the one that was part of Debian 9), and while it was correctly stored into the calender at that time the invitation is now rendered with an offset of one hour in KMail.
Back in 2005(!) a similar bug was reported at #106149
Created attachment 112263 [details]
Screenshot of the imported event
Created attachment 112264 [details]
Screenshot in korganizers preview
Created attachment 112266 [details]
Invitation correctly imported one year ago
This invitation has correctly imported one year ago but is now imported with UTC+0100 instead of UTC+0200.
I imported your calendar invite into KOrganizer and it shows up on 16 May at 0700 New York timezone (which is my system timezone)
translates to 1300 Berlin
which is correct AFAICT
I wonder which libical you are using. I'm using libical 3.0.x
KDE neon (User Edition) comes with libcal2-2.0.0-4+16.04+xenial+build1.
I'm pretty sure upgrading the Neon libical to version 3.0.x will fix this.
Might be the same bug as mentioned in https://github.com/libical/libical/issues/58
Btw., libical3 isn't available for the user version of KDE neon, yet. And I didn't find it in dev/stable nor in dev/unstable.
Still having the same problem with Ubuntu 18.04 and 18.10. The later comes with libical3-3.0.4. So libical 3.x doesn't resolve the issue.
Sidenote: an invitation for a date in CET instead of CEST is parsed correctly.
Created attachment 115868 [details]
New anomized invitation
Created attachment 115869 [details]
How the invitation is displayed
Notice the difference between the mail's subject and the parsed time.