There is no need to use UTC datetime

src/xlsx/xlsxutility.cpp

@@ -57,7 +57,7 @@ QStringList splitPath(const QString &path)
 double datetimeToNumber(const QDateTime &dt, bool is1904)
 {
     //Note, for number 0, Excel2007 shown as 1900-1-0, which should be 1899-12-31
-    QDateTime epoch(is1904 ? QDate(1904, 1, 1): QDate(1899, 12, 31), QTime(0,0), Qt::UTC);
+    QDateTime epoch(is1904 ? QDate(1904, 1, 1): QDate(1899, 12, 31), QTime(0,0));
 
     double excel_time = epoch.msecsTo(dt) / (1000*60*60*24.0);
     if (!is1904 && excel_time > 59) {//31+28
@@ -73,7 +73,7 @@ QDateTime datetimeFromNumber(double num, bool is1904)
         num = num - 1;
 
     qint64 msecs = static_cast<qint64>(num * 1000*60*60*24.0);
-    QDateTime epoch(is1904 ? QDate(1904, 1, 1): QDate(1899, 12, 31), QTime(0,0), Qt::UTC);
+    QDateTime epoch(is1904 ? QDate(1904, 1, 1): QDate(1899, 12, 31), QTime(0,0));
 
     return epoch.addMSecs(msecs);
 }

tests/auto/document/tst_documenttest.cpp

@@ -178,7 +178,7 @@ void DocumentTest::testReadWriteDateTime()
     device.open(QIODevice::WriteOnly);
 
     Document xlsx1;
-    QDateTime dt(QDate(2012, 11, 12), QTime(6, 0), Qt::UTC);
+    QDateTime dt(QDate(2012, 11, 12), QTime(6, 0));
 
     xlsx1.write("A1", dt);
 

tests/auto/utility/tst_utilitytest.cpp

@@ -115,13 +115,13 @@ void UtilityTest::test_datetimeToNumber_data()
     QTest::addColumn<double>("num");
 
     //Note, for number 0, Excel2007 shown as 1900-1-0, which should be 1899-12-31
-    QTest::newRow("0") << QDateTime(QDate(1899, 12, 31), QTime(0,0), Qt::UTC) << false << 0.0;
-    QTest::newRow("1.25") << QDateTime(QDate(1900, 1, 1), QTime(6, 0), Qt::UTC) << false << 1.25;
-    QTest::newRow("59") << QDateTime(QDate(1900, 2, 28), QTime(0, 0), Qt::UTC) << false << 59.0;
-    QTest::newRow("61") << QDateTime(QDate(1900, 3, 1), QTime(0, 0), Qt::UTC) << false << 61.0;
+    QTest::newRow("0") << QDateTime(QDate(1899, 12, 31), QTime(0,0)) << false << 0.0;
+    QTest::newRow("1.25") << QDateTime(QDate(1900, 1, 1), QTime(6, 0)) << false << 1.25;
+    QTest::newRow("59") << QDateTime(QDate(1900, 2, 28), QTime(0, 0)) << false << 59.0;
+    QTest::newRow("61") << QDateTime(QDate(1900, 3, 1), QTime(0, 0)) << false << 61.0;
 
-    QTest::newRow("1904: 0") << QDateTime(QDate(1904, 1, 1), QTime(0,0), Qt::UTC) << true << 0.0;
-    QTest::newRow("1904: 1.25") << QDateTime(QDate(1904, 1, 2), QTime(6, 0), Qt::UTC) << true << 1.25;
+    QTest::newRow("1904: 0") << QDateTime(QDate(1904, 1, 1), QTime(0,0)) << true << 0.0;
+    QTest::newRow("1904: 1.25") << QDateTime(QDate(1904, 1, 2), QTime(6, 0)) << true << 1.25;
 }
 
 void UtilityTest::test_datetimeToNumber()
@@ -139,13 +139,13 @@ void UtilityTest::test_datetimeFromNumber_data()
     QTest::addColumn<bool>("is1904");
     QTest::addColumn<double>("num");
 
-    QTest::newRow("0") << QDateTime(QDate(1899, 12, 31), QTime(0,0), Qt::UTC) << false << 0.0;
-    QTest::newRow("1.25") << QDateTime(QDate(1900, 1, 1), QTime(6, 0), Qt::UTC) << false << 1.25;
-    QTest::newRow("59") << QDateTime(QDate(1900, 2, 28), QTime(0,0), Qt::UTC) << false << 59.0;
-    QTest::newRow("61") << QDateTime(QDate(1900, 3, 1), QTime(0,0), Qt::UTC) << false << 61.0;
+    QTest::newRow("0") << QDateTime(QDate(1899, 12, 31), QTime(0,0)) << false << 0.0;
+    QTest::newRow("1.25") << QDateTime(QDate(1900, 1, 1), QTime(6, 0)) << false << 1.25;
+    QTest::newRow("59") << QDateTime(QDate(1900, 2, 28), QTime(0,0)) << false << 59.0;
+    QTest::newRow("61") << QDateTime(QDate(1900, 3, 1), QTime(0,0)) << false << 61.0;
 
-    QTest::newRow("1904: 0") << QDateTime(QDate(1904, 1, 1), QTime(0,0), Qt::UTC) << true << 0.0;
-    QTest::newRow("1904: 1.25") << QDateTime(QDate(1904, 1, 2), QTime(6, 0), Qt::UTC) << true << 1.25;
+    QTest::newRow("1904: 0") << QDateTime(QDate(1904, 1, 1), QTime(0,0)) << true << 0.0;
+    QTest::newRow("1904: 1.25") << QDateTime(QDate(1904, 1, 2), QTime(6, 0)) << true << 1.25;
 }
 
 void UtilityTest::test_datetimeFromNumber()