diff --git a/src/xlsxworkbook.cpp b/src/xlsxworkbook.cpp
index 478fadf..0930424 100755
--- a/src/xlsxworkbook.cpp
+++ b/src/xlsxworkbook.cpp
@@ -45,6 +45,7 @@ Workbook::Workbook(QObject *parent) :
     m_window_height = 9660;
 
     m_strings_to_numbers_enabled = false;
+    m_date1904 = false;
     m_activesheet = 0;
     m_firstsheet = 0;
     m_table_count = 0;
@@ -77,6 +78,23 @@ void Workbook::save(const QString &name)
     package.createPackage(name);
 }
 
+bool Workbook::isDate1904() const
+{
+    return m_date1904;
+}
+
+/*
+ Excel for Windows uses a default epoch of 1900 and Excel
+ for Mac uses an epoch of 1904. However, Excel on either
+ platform will convert automatically between one system
+ and the other. QtXlsxWriter stores dates in the 1900 format
+ by default.
+*/
+void Workbook::setDate1904(bool date1904)
+{
+    m_date1904 = date1904;
+}
+
 /*
   Enable the worksheet.write() method to convert strings
   to numbers, where possible, using float() in order to avoid
@@ -148,6 +166,8 @@ void Workbook::saveToXmlFile(QIODevice *device)
 //    writer.writeAttribute("codeName", "{37E998C4-C9E5-D4B9-71C8-EB1FF731991C}");
 
     writer.writeEmptyElement("workbookPr");
+    if (m_date1904)
+        writer.writeAttribute("date1904", "1");
     writer.writeAttribute("defaultThemeVersion", "124226");
 
     writer.writeStartElement("bookViews");
diff --git a/src/xlsxworkbook.h b/src/xlsxworkbook.h
index d84d064..4c727ed 100755
--- a/src/xlsxworkbook.h
+++ b/src/xlsxworkbook.h
@@ -48,6 +48,9 @@ public:
     Format *addFormat();
 //    void addChart();
     void defineName(const QString &name, const QString &formula);
+    bool isDate1904() const;
+    void setDate1904(bool date1904);
+    bool isStringsToNumbersEnabled() const;
     void setStringsToNumbersEnabled(bool enable=true);
 
     void save(const QString &name);
@@ -59,13 +62,13 @@ private:
     QList<Worksheet *> worksheets() const;
     SharedStrings *sharedStrings();
     Styles *styles();
-    bool isStringsToNumbersEnabled() const;
     void saveToXmlFile(QIODevice *device);
 
     SharedStrings *m_sharedStrings;
     QList<Worksheet *> m_worksheets;
     Styles *m_styles;
     bool m_strings_to_numbers_enabled;
+    bool m_date1904;
 
     int m_x_window;
     int m_y_window;