diff --git a/HelloExcel/readStyle.cpp b/HelloExcel/readStyle.cpp
index 85192af..9743112 100644
--- a/HelloExcel/readStyle.cpp
+++ b/HelloExcel/readStyle.cpp
@@ -37,14 +37,15 @@ int readMSExcel201x();
 
 int readStyle()
 {
-	readGoogleSpreadsheet();
+	int ret = readGoogleSpreadsheet();
+
 	return 0; 
 }
 
 int readGoogleSpreadsheet()
 {
 	Document xlsx("google-spreadsheet.xlsx"); // google docs 
-	// Document xlsx("date-time.xlsx"); // ms office online
+
 
 	if (!xlsx.isLoadPackage())
 	{
@@ -56,11 +57,11 @@ int readGoogleSpreadsheet()
 	{
 		if (Cell* cell = xlsx.cellAt(row, 1))
 		{
-			if (cell == NULL)
+			if ( cell == NULL )
 				continue;
 			QVariant var = cell->readValue();
 			qint32 styleNo = cell->styleNumber();
-			if (styleNo >= 0)
+			if ( styleNo >= 0 )
 			{
 				qDebug() << row << " " << var << " , style:" << styleNo;
 			}
@@ -71,7 +72,7 @@ int readGoogleSpreadsheet()
 		}
 	}
 
-	/* debug output
+	/* Deug output 
 	1   QVariant(double, 1)  , style: 1
 	2   QVariant(QString, "2")  , style: 2
 	3   QVariant(double, 3)  , style: 3
@@ -82,13 +83,12 @@ int readGoogleSpreadsheet()
 	8   QVariant(double, 8)  , style: 8
 	9   QVariant(double, 9)  , style: 9
 	10   QVariant(QString, "1900. 1. 9")  , style: 10
-	11   QVariant(QDateTime, QDateTime(1900-01-11 00:00:00.000 KST Qt::TimeSpec(LocalTime)))  , style: 11
+	11   QVariant(QTime, QTime("00:00:00.000"))  , style: 11
 	12   QVariant(QString, "1900. 1. 11 AM 12:00:00")  , style: 12
 	13   QVariant(QDateTime, QDateTime(1900-01-13 00:00:00.000 KST Qt::TimeSpec(LocalTime)))  , style: 13
 	*/
 
-	/* 
-     testing fo read google spreadsheet file (made by google docs) 
+	/* Testing fo read google spreadsheet file (made by google docs) 
   	 https://github.com/j2doll/QXlsx/blob/master/image/LibreOffice-Google-XLSX.png
 
 	1   QVariant(double, 1) OK:it's auto style (1)
@@ -118,6 +118,8 @@ int readLibreOffice()
 
 int readMSExcel201x()
 {
+	// Document xlsx("date-time.xlsx"); // ms office online
+
 	return 0;
 }
 
diff --git a/QXlsx/source/xlsxcell.cpp b/QXlsx/source/xlsxcell.cpp
index 7618268..c1d7dfa 100644
--- a/QXlsx/source/xlsxcell.cpp
+++ b/QXlsx/source/xlsxcell.cpp
@@ -124,35 +124,40 @@ QVariant Cell::readValue() const
 {
 	Q_D(const Cell);
 
-	QVariant ret;
+	QVariant ret; // return value 
 	ret = d->value;
 
 	if (isDateTime())
 	{
 		QDateTime dt = dateTime(); 
 		ret = dt;
-		return ret; 
 
-		/*
-		double val = d->value.toDouble();
-		if (val < 1)
+		qint32 styleNo = d->styleNumber;
+
+		if (styleNo == 10)
 		{
-			ret = dt.time(); // it's time type 
-			return ret; 
+
 		}
 
-		double dFmod = fmod(val, double(1.0));
-		double dRValue = 1.0 / (1000 * 60 * 60 * 24);
-		if ( dFmod < dRValue )
+		if (styleNo == 11) // only time 
 		{
-			ret = dt.date(); // it's date type  
+			QTime timeValue = dt.time();
+			ret = timeValue;
 			return ret;
 		}
 
-		ret = dt;
-		return ret;
-		*/
-	}
+		if (styleNo == 12) 
+		{
+
+		}
+
+		if (styleNo == 13)
+		{
+
+		}
+
+		return ret; 
+ 	}
 
 	if (hasFormula())
 	{