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diff --git a/include/tools/datetime.hxx b/include/tools/datetime.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef _DATETIME_HXX
+#define _DATETIME_HXX
+
+#include "tools/toolsdllapi.h"
+#include <tools/solar.h>
+#include <tools/date.hxx>
+#include <tools/time.hxx>
+
+class TOOLS_DLLPUBLIC SAL_WARN_UNUSED DateTime : public Date, public Time
+{
+public:
+    enum DateTimeInitSystem
+    {
+        SYSTEM
+    };
+
+    // TODO temporary until all uses are inspected and resolved
+    enum DateTimeInitEmpty
+    {
+        EMPTY
+    };
+
+                    DateTime( DateTimeInitEmpty ) : Date( Date::EMPTY ), Time( Time::EMPTY ) {}
+                    DateTime( DateTimeInitSystem ) : Date( Date::SYSTEM ), Time( Time::SYSTEM ) {}
+                    DateTime( const DateTime& rDateTime ) :
+                        Date( rDateTime ), Time( rDateTime ) {}
+                    DateTime( const Date& rDate ) : Date( rDate ), Time(0) {}
+                    DateTime( const Time& rTime ) : Date(0), Time( rTime ) {}
+                    DateTime( const Date& rDate, const Time& rTime ) :
+                        Date( rDate ), Time( rTime ) {}
+
+    sal_Bool        IsBetween( const DateTime& rFrom,
+                               const DateTime& rTo ) const;
+
+    sal_Bool        IsEqualIgnoreNanoSec( const DateTime& rDateTime ) const
+                    {
+                        if ( Date::operator!=( rDateTime ) )
+                            return sal_False;
+                        return Time::IsEqualIgnoreNanoSec( rDateTime );
+                    }
+
+    sal_Bool        operator ==( const DateTime& rDateTime ) const
+                        { return (Date::operator==( rDateTime ) &&
+                                  Time::operator==( rDateTime )); }
+    sal_Bool        operator !=( const DateTime& rDateTime ) const
+                        { return (Date::operator!=( rDateTime ) ||
+                                  Time::operator!=( rDateTime )); }
+    sal_Bool        operator  >( const DateTime& rDateTime ) const;
+    sal_Bool        operator  <( const DateTime& rDateTime ) const;
+    sal_Bool        operator >=( const DateTime& rDateTime ) const;
+    sal_Bool        operator <=( const DateTime& rDateTime ) const;
+
+    long            GetSecFromDateTime( const Date& rDate ) const;
+
+    void            ConvertToUTC()       { *this -= Time::GetUTCOffset(); }
+    void            ConvertToLocalTime() { *this += Time::GetUTCOffset(); }
+
+    DateTime&       operator +=( long nDays )
+                        { Date::operator+=( nDays ); return *this; }
+    DateTime&       operator -=( long nDays )
+                        { Date::operator-=( nDays ); return *this; }
+    DateTime&       operator +=( double fTimeInDays );
+    DateTime&       operator -=( double fTimeInDays )
+                        { return operator+=( -fTimeInDays ); }
+    DateTime&       operator +=( const Time& rTime );
+    DateTime&       operator -=( const Time& rTime );
+
+    TOOLS_DLLPUBLIC friend DateTime operator +( const DateTime& rDateTime, long nDays );
+    TOOLS_DLLPUBLIC friend DateTime operator -( const DateTime& rDateTime, long nDays );
+    TOOLS_DLLPUBLIC friend DateTime operator +( const DateTime& rDateTime, double fTimeInDays );
+    TOOLS_DLLPUBLIC friend DateTime operator -( const DateTime& rDateTime, double fTimeInDays )
+                        { return operator+( rDateTime, -fTimeInDays ); }
+    TOOLS_DLLPUBLIC friend DateTime operator +( const DateTime& rDateTime, const Time& rTime );
+    TOOLS_DLLPUBLIC friend DateTime operator -( const DateTime& rDateTime, const Time& rTime );
+    TOOLS_DLLPUBLIC friend double   operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 );
+    TOOLS_DLLPUBLIC friend long     operator -( const DateTime& rDateTime, const Date& rDate )
+                        { return (const Date&) rDateTime - rDate; }
+
+    DateTime&       operator =( const DateTime& rDateTime );
+
+    void            GetWin32FileDateTime( sal_uInt32 & rLower, sal_uInt32 & rUpper );
+    static DateTime CreateFromWin32FileDateTime( const sal_uInt32 & rLower, const sal_uInt32 & rUpper );
+};
+
+inline DateTime& DateTime::operator =( const DateTime& rDateTime )
+{
+    Date::operator=( rDateTime );
+    Time::operator=( rDateTime );
+    return *this;
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */