Handle specified time-spec in date-time parsing

When a date-time was parsed from a string, the result was equal (as a
date-time) to the correct value, but had (at least in some cases) the
wrong spec, where it should have had a spec reflecting the zone
specifier parsed.

The time-spec imposed for the benefit of QDateTimeEdit is now moved
from QDateTimeParser to QDateTimeEditPrivate, which takes over
responsibility for imposing it. QDateTimeParser assumes Qt::LocalTime
in member functions (where applicable) and uses the time-spec parsed
from the string when constructing the date-time.

QDateTime::fromString() and QLocale::toDateTime() are updated to
use the full QDateTime returned by QDateTimeParser.

Fixes: QTBUG-83075
Done-With: Edward Welbourne <edward.welbourne@qt.io>
Change-Id: I8b79add2c7fc13a200e1252d48dbfa70b36757bf
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/widgets/widgets/qdatetimeedit.cpp b/src/widgets/widgets/qdatetimeedit.cpp
index d145985c1d..deb4dc36ba 100644
--- a/src/widgets/widgets/qdatetimeedit.cpp
+++ b/src/widgets/widgets/qdatetimeedit.cpp
@@ -1976,7 +1976,14 @@ QDateTime QDateTimeEditPrivate::validateAndInterpret(QString &input, int &positi
             return minimum.toDateTime();
         }
     }
+
     StateNode tmp = parse(input, position, value.toDateTime(), fixup);
+    // Impose this widget's spec:
+    tmp.value = tmp.value.toTimeSpec(spec);
+    // ... but that might turn a valid datetime into an invalid one:
+    if (!tmp.value.isValid() && tmp.state == Acceptable)
+        tmp.state = Intermediate;
+
     input = tmp.input;
     position += tmp.padded;
     state = QValidator::State(int(tmp.state));