Allow the global JS UTC offset to be invalidated

If the system timezone is changed, it is necessary to inform
V8 so that the global offset-from-UTC value can be recalculated.
This changes adds the 'timeZoneUpdated' function to the JS
'Date' class exported by QML, which allows QML applications to
inform V8 when the timezone has been updated.

Change-Id: Ic5898ca7bc640002a4a6fd5a52b8623d87ee8085
Reviewed-by: Martin Jones <martin.jones@nokia.com>

2 files changed, 92 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllocale/data/timeZoneUpdated.qml b/tests/auto/qml/qqmllocale/data/timeZoneUpdated.qml
new file mode 100644
index 0000000000..92d1f5bc40
--- /dev/null
+++ b/tests/auto/qml/qqmllocale/data/timeZoneUpdated.qml
@@ -0,0 +1,51 @@
+import QtQuick 2.0
+
+Item {
+    property bool success: false
+
+    property date localDate
+    property date utcDate
+
+    Component.onCompleted: {
+        // Test date: 2012-06-01T02:15:30+10:00 (AEST timezone)
+        localDate = new Date(2012, 6-1, 1, 2, 15, 30)
+        utcDate = new Date(Date.UTC(2012, 6-1, 1, 2, 15, 30))
+
+        if (localDate.getTimezoneOffset() != -600) return
+
+        if (localDate.toLocaleString() != "Friday, June 1, 2012 2:15:30 AM AEST") return
+        if (localDate.toISOString() != "2012-05-31T16:15:30.000Z") return
+
+        if (utcDate.toISOString() != "2012-06-01T02:15:30.000Z") return
+        if (utcDate.toLocaleString() != "Friday, June 1, 2012 12:15:30 PM AEST") return
+
+        success = true
+    }
+
+    function check() {
+        success = false
+
+        // We have changed to IST time zone - inform JS:
+        Date.timeZoneUpdated()
+
+        if (localDate.getTimezoneOffset() != -330) return
+
+        if (localDate.toLocaleString() != "Friday, June 1, 2012 2:15:30 AM IST") return
+        if (localDate.toISOString() != "2012-05-31T20:45:30.000Z") return
+
+        if (utcDate.toISOString() != "2012-06-01T06:45:30.000Z") return
+        if (utcDate.toLocaleString() != "Friday, June 1, 2012 12:15:30 PM IST") return
+
+        // Create new dates in this timezone
+        localDate = new Date(2012, 6-1, 1, 2, 15, 30)
+        utcDate = new Date(Date.UTC(2012, 6-1, 1, 2, 15, 30))
+
+        if (localDate.toLocaleString() != "Friday, June 1, 2012 2:15:30 AM IST") return
+        if (localDate.toISOString() != "2012-05-31T20:45:30.000Z") return
+
+        if (utcDate.toISOString() != "2012-06-01T02:15:30.000Z") return
+        if (utcDate.toLocaleString() != "Friday, June 1, 2012 7:45:30 AM IST") return
+
+        success = true
+    }
+}
diff --git a/tests/auto/qml/qqmllocale/tst_qqmllocale.cpp b/tests/auto/qml/qqmllocale/tst_qqmllocale.cpp
index e74570261f..c39426375f 100644
--- a/tests/auto/qml/qqmllocale/tst_qqmllocale.cpp
+++ b/tests/auto/qml/qqmllocale/tst_qqmllocale.cpp
@@ -47,6 +47,8 @@
 #include <qcolor.h>
 #include "../../shared/util.h"
 
+#include <time.h>
+
 class tst_qqmllocale : public QQmlDataTest
 {
     Q_OBJECT
@@ -80,6 +82,7 @@ private slots:
     void dateTimeFormat();
     void timeFormat_data();
     void timeFormat();
+    void timeZoneUpdated();
 
     void dateToLocaleString_data();
     void dateToLocaleString();
@@ -1214,6 +1217,44 @@ void tst_qqmllocale::stringLocaleCompare()
     QCOMPARE(obj->property("comparison").toInt(), QString::localeAwareCompare(string1, string2));
 }
 
+static void setTimeZone(const QByteArray &tz)
+{
+    qputenv("TZ", tz);
+#if defined(Q_OS_WIN32)
+    ::_tzset();
+#elif defined(Q_OS_UNIX)
+    ::tzset();
+#endif
+}
+
+void tst_qqmllocale::timeZoneUpdated()
+{
+#if !defined(Q_OS_WIN32) && !defined(Q_OS_UINX)
+    QSKIP("Timezone manipulation not available for this platform");
+#endif
+
+    QByteArray original(qgetenv("TZ"));
+
+    // Set the timezone to Brisbane time
+    setTimeZone(QByteArray("AEST-10:00"));
+
+    QQmlEngine e;
+    QQmlComponent c(&e, testFileUrl("timeZoneUpdated.qml"));
+    QScopedPointer<QObject> obj(c.create());
+    QVERIFY(obj);
+    QCOMPARE(obj->property("success").toBool(), true);
+
+    // Change to Indian time
+    setTimeZone(QByteArray("IST-05:30"));
+
+    QMetaObject::invokeMethod(obj.data(), "check");
+
+    // Reset to original time
+    setTimeZone(original);
+
+    QCOMPARE(obj->property("success").toBool(), true);
+}
+
 QTEST_MAIN(tst_qqmllocale)
 
 #include "tst_qqmllocale.moc"