Add a benchmark of Date.getTimeZoneOffset()

Test at many moments from spring 1967 (before the epoch) to summer
2046 (after 32-bit time_t's sign-wrap).

Change-Id: I3932cc1553a868b8815fda9a8dfc7644e4485704
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/benchmarks/qml/javascript/data/zoneOffset.qml b/tests/benchmarks/qml/javascript/data/zoneOffset.qml
new file mode 100644
index 0000000000..c2a1873ca5
--- /dev/null
+++ b/tests/benchmarks/qml/javascript/data/zoneOffset.qml
@@ -0,0 +1,16 @@
+// Benchmarks determination of local time-zone offset.
+// This can be sensitive to changes to QTimeZone or QDateTime (depends on platform).
+
+import QtQuick 2.0
+
+QtObject {
+    function runtest() {
+        var tick = -864e8; // 1000 days before the epoch
+        for (var ii = 0; ii < 5000000; ++ii) {
+            new Date(tick).getTimezoneOffset();
+            tick += 5e5;
+        }
+        // 25e11 milliseconds is about 79 years; so we span from
+        // the start of 1967-04-07 to 2046-6-26 04:18:20.
+    }
+}