QDateTimeParser: implement parsing of time-zone specifiers

The serialization of date-times understood time-zones (indicated by a
't' in a format string) but the parsing didn't (so viewed the 't' as a
literal element in the format string, not matched by the actual zone
it needs to parse), although some tests expected it to.
This made round-trip testing fail.

Implemented parsing of time-zones.
Re-enabled the formerly failing tests.

[ChangeLog][QtCore][QDateTime] Added support for parsing of time-zones.

Task-number: QTBUG-22833
Change-Id: Iddba7dca14cf9399587078d4cea19f9b95a65cf7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/corelib/tools/qdatetime.cpp b/src/corelib/tools/qdatetime.cpp
index b09499d25b..b6f43f0864 100644
--- a/src/corelib/tools/qdatetime.cpp
+++ b/src/corelib/tools/qdatetime.cpp
@@ -2221,6 +2221,26 @@ static QString qt_tzname(QDateTimePrivate::DaylightStatus daylightStatus)
 #endif // Q_OS_WIN
 }
 
+#ifndef QT_BOOTSTRAPPED
+/*
+  \internal
+  Implemented here to share qt_tzname()
+*/
+int QDateTimeParser::startsWithLocalTimeZone(const QStringRef name)
+{
+    QDateTimePrivate::DaylightStatus zones[2] = {
+        QDateTimePrivate::StandardTime,
+        QDateTimePrivate::DaylightTime
+    };
+    for (const auto z : zones) {
+        QString zone(qt_tzname(z));
+        if (name.startsWith(zone))
+            return zone.size();
+    }
+    return 0;
+}
+#endif // QT_BOOTSTRAPPED
+
 // Calls the platform variant of mktime for the given date, time and daylightStatus,
 // and updates the date, time, daylightStatus and abbreviation with the returned values
 // If the date falls outside the 1970 to 2037 range supported by mktime / time_t