Merge branch 'simplify-time-formatting' of https://github.com/justjanne/quassel

Closes #504.

diff --combined tests/common/utiltest.cpp
index 0000000,55f5329..47db277
mode 000000,100644..100644
--- /dev/null
--- 2/tests/common/utiltest.cpp
+++ b/tests/common/utiltest.cpp
@@@ -1,0 -1,38 +1,38 @@@
 -}
+ /***************************************************************************
+  *   Copyright (C) 2005-2019 by the Quassel Project                        *
+  *   devel@quassel-irc.org                                                 *
+  *                                                                         *
+  *   This program is free software; you can redistribute it and/or modify  *
+  *   it under the terms of the GNU General Public License as published by  *
+  *   the Free Software Foundation; either version 2 of the License, or     *
+  *   (at your option) version 3.                                           *
+  *                                                                         *
+  *   This program is distributed in the hope that it will be useful,       *
+  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+  *   GNU General Public License for more details.                          *
+  *                                                                         *
+  *   You should have received a copy of the GNU General Public License     *
+  *   along with this program; if not, write to the                         *
+  *   Free Software Foundation, Inc.,                                       *
+  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
+  ***************************************************************************/
+ 
+ #include "testglobal.h"
+ #include "util.h"
+ #include <QDebug>
+ #include <QDateTime>
+ #include <QTimeZone>
+ 
+ TEST(UtilTest, formatDateTimeToOffsetISO) {
+     QDateTime dateTime{{2006, 01, 02}, {15, 04, 05}, QTimeZone{"UTC+01:00"}};
+ 
+     ASSERT_TRUE(dateTime.isValid());
+     ASSERT_FALSE(dateTime.isNull());
+ 
+     EXPECT_EQ(formatDateTimeToOffsetISO(dateTime), QString("2006-01-02 15:04:05+01:00"));
+     EXPECT_EQ(formatDateTimeToOffsetISO(dateTime.toUTC()), QString("2006-01-02 14:04:05Z"));
+     EXPECT_EQ(formatDateTimeToOffsetISO(dateTime.toOffsetFromUtc(0)), QString("2006-01-02 14:04:05Z"));
+     EXPECT_EQ(formatDateTimeToOffsetISO(dateTime.toOffsetFromUtc(7200)), QString("2006-01-02 16:04:05+02:00"));
+     EXPECT_EQ(formatDateTimeToOffsetISO(dateTime.toTimeZone(QTimeZone{"UTC"})), QString("2006-01-02 14:04:05Z"));
++}