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diff --git a/src/lib/tools/filetime.h b/src/lib/tools/filetime.h
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+/**************************************************************************
+**
+** This file is part of the Qt Build Suite
+**
+** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file.
+** Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**************************************************************************/
+
+#ifndef FILETIME_H
+#define FILETIME_H
+
+#include <QtCore/QDataStream>
+#include <QtCore/QDebug>
+
+#if defined(Q_OS_UNIX)
+#include <time.h>
+#endif
+
+namespace qbs {
+
+class FileTime
+{
+public:
+#if defined(Q_OS_UNIX)
+    typedef time_t InternalType;
+#elif defined(Q_OS_WIN)
+    typedef quint64 InternalType;
+#else
+#   error unknown platform
+#endif
+
+    FileTime();
+    FileTime(const InternalType &ft)
+        : m_fileTime(ft)
+    { }
+
+    bool operator < (const FileTime &rhs) const;
+    bool operator > (const FileTime &rhs) const;
+    bool operator <= (const FileTime &rhs) const;
+    bool operator >= (const FileTime &rhs) const;
+    bool operator == (const FileTime &rhs) const;
+
+    void clear();
+    bool isValid() const;
+    QString toString() const;
+
+    static FileTime currentTime();
+
+    friend class FileInfo;
+    InternalType m_fileTime;
+};
+
+inline bool FileTime::operator > (const FileTime &rhs) const
+{
+    return rhs < *this;
+}
+
+inline bool FileTime::operator <= (const FileTime &rhs) const
+{
+    return operator < (rhs) || operator == (rhs);
+}
+
+inline bool FileTime::operator >= (const FileTime &rhs) const
+{
+    return operator > (rhs) || operator == (rhs);
+}
+
+inline bool FileTime::operator == (const FileTime &rhs) const
+{
+    return m_fileTime == rhs.m_fileTime;
+}
+
+} // namespace qbs
+
+QT_BEGIN_NAMESPACE
+
+inline QDataStream& operator>>(QDataStream &stream, qbs::FileTime &ft)
+{
+    quint64 u;
+    stream >> u;
+    ft.m_fileTime = u;
+    return stream;
+}
+
+inline QDataStream& operator<<(QDataStream &stream, const qbs::FileTime &ft)
+{
+    stream << (quint64)ft.m_fileTime;
+    return stream;
+}
+
+inline QDebug operator<<(QDebug dbg, const qbs::FileTime &t)
+{
+    dbg.nospace() << t.toString();
+    return dbg.space();
+}
+
+QT_END_NAMESPACE
+
+#endif // FILETIME_H