Public bug reported:

Steps to reproduce:
1. Make calendar entry in gnome-calendar in Personal(not online) calendar. 
To be precise I've imported calendar entry via ICS file via Evolution but the 
file didn't contain any time zone related entry. 
2. Calendar was properly introduced showing me locally proper time of event, in 
line with my local timezone.
3. Open calendar entry by double click, change on upper bar name of calendar 
from personal to one of Google Calendars .
4. Time of event is shifted 

In my case time of the shift is -1 hour . This corresponds my current
timezone GMT+1 so it seems item is passed without timezone resulting in
UTC time presented as local. Additionally when I shift time of event
during editing by one minute then there is no hour shift so it seems
error is generated exactly in this dialog box but only for imported
entries - if I create new one manually then it works properly. So for
reproducing, this is content of the ICS file with personal details
scraped out:

BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
URL:https://example.com/path/
DTSTART:20201128T110000Z
DTEND:20201128T114500Z
SUMMARY:[A&B] - IN CASE THIS AMPERSAND COULD HAVE ANY IMPORTANCE I LEAVE IT
DESCRIPTION:By Wojciech Lesicki
LOCATION:https://example.com
END:VEVENT
END:VCALENDAR

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-calendar 3.28.2-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
Uname: Linux 4.15.0-124-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 27 20:16:33 2020
InstallationDate: Installed on 2015-05-08 (2030 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-calendar
UpgradeStatus: Upgraded to bionic on 2018-08-26 (823 days ago)

** Affects: gnome-calendar (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages

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https://bugs.launchpad.net/bugs/1906059

Title:
  Gnome calendar mishandles timezone during moving across calendars

Status in gnome-calendar package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Make calendar entry in gnome-calendar in Personal(not online) calendar. 
  To be precise I've imported calendar entry via ICS file via Evolution but the 
file didn't contain any time zone related entry. 
  2. Calendar was properly introduced showing me locally proper time of event, 
in line with my local timezone.
  3. Open calendar entry by double click, change on upper bar name of calendar 
from personal to one of Google Calendars .
  4. Time of event is shifted 

  In my case time of the shift is -1 hour . This corresponds my current
  timezone GMT+1 so it seems item is passed without timezone resulting
  in UTC time presented as local. Additionally when I shift time of
  event during editing by one minute then there is no hour shift so it
  seems error is generated exactly in this dialog box but only for
  imported entries - if I create new one manually then it works
  properly. So for reproducing, this is content of the ICS file with
  personal details scraped out:

  BEGIN:VCALENDAR
  VERSION:2.0
  BEGIN:VEVENT
  URL:https://example.com/path/
  DTSTART:20201128T110000Z
  DTEND:20201128T114500Z
  SUMMARY:[A&B] - IN CASE THIS AMPERSAND COULD HAVE ANY IMPORTANCE I LEAVE IT
  DESCRIPTION:By Wojciech Lesicki
  LOCATION:https://example.com
  END:VEVENT
  END:VCALENDAR

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-calendar 3.28.2-0ubuntu0.18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
  Uname: Linux 4.15.0-124-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 27 20:16:33 2020
  InstallationDate: Installed on 2015-05-08 (2030 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=pl_PL.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-calendar
  UpgradeStatus: Upgraded to bionic on 2018-08-26 (823 days ago)

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