gnome-calendar does not use the proper system timezone

[Ben Yanke]

Calendar source:
Evolution (exchange calendar via evolution-ews)

In evolution, the calendar properly shows events in my timezone (CST). For example, Event1 at 9:30am and Event2 at 3pm (actual examples, just changed names).

In gnome-calendar, these events show up at 4:30am and 10am, respectively. This issue also appears in the California calendar.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-calendar 3.20.4-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Aug 2 11:29:21 2017
ExecutablePath: /usr/bin/gnome-calendar
InstallationDate: Installed on 2017-07-03 (29 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
ProcEnviron:
 XDG_RUNTIME_DIR=<set>
 SHELL=/bin/bash
 LANGUAGE=en_US
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: gnome-calendar
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.