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diff --git a/boost/icl/gregorian.hpp b/boost/icl/gregorian.hpp
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+++ b/boost/icl/gregorian.hpp
@@ -0,0 +1,127 @@
+/*-----------------------------------------------------------------------------+
+Copyright (c) 2008-2009: Joachim Faulhaber
++------------------------------------------------------------------------------+
+   Distributed under the Boost Software License, Version 1.0.
+      (See accompanying file LICENCE.txt or copy at
+           http://www.boost.org/LICENSE_1_0.txt)
++-----------------------------------------------------------------------------*/
+#ifndef BOOST_ICL_GREGORIAN_DATE_HPP_JOFA_080416
+#define BOOST_ICL_GREGORIAN_DATE_HPP_JOFA_080416
+
+#include <boost/icl/detail/boost_config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#ifdef BOOST_MSVC 
+#pragma warning(push)
+#pragma warning(disable:4100) // unreferenced formal parameter
+#pragma warning(disable:4127) // conditional expression is constant
+#pragma warning(disable:4244) // 'argument' : conversion from 'int' to 'unsigned short', possible loss of data
+#pragma warning(disable:4702) // boost\lexical_cast.hpp(1159) : warning C4702: unreachable code
+#pragma warning(disable:4996) // Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators'
+#endif
+
+#include <stdio.h>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <boost/date_time/gregorian/gregorian.hpp>
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#include <boost/icl/type_traits/identity_element.hpp>
+#include <boost/icl/type_traits/is_discrete.hpp>
+#include <boost/icl/type_traits/difference_type_of.hpp>
+#include <boost/icl/type_traits/size_type_of.hpp>
+
+namespace boost{namespace icl
+{
+    template<> struct is_discrete<boost::gregorian::date>
+    {
+        typedef is_discrete type;
+        BOOST_STATIC_CONSTANT(bool, value = true);
+    };
+
+    template<> 
+    inline boost::gregorian::date identity_element<boost::gregorian::date>::value()
+    { 
+        return boost::gregorian::date(boost::gregorian::min_date_time); 
+    }
+
+    template<> 
+    struct identity_element<boost::gregorian::date_duration>
+    {
+        static boost::gregorian::date_duration value()
+        { 
+            return boost::gregorian::date(boost::gregorian::min_date_time) 
+                 - boost::gregorian::date(boost::gregorian::min_date_time); 
+        }
+    };
+
+    template<> 
+    struct has_difference<boost::gregorian::date> 
+    { 
+        typedef has_difference type;
+        BOOST_STATIC_CONSTANT(bool, value = true);
+    };  
+
+    template<> 
+    struct difference_type_of<boost::gregorian::date> 
+    { typedef boost::gregorian::date_duration type; };  
+
+    template<> 
+    struct size_type_of<boost::gregorian::date> 
+    { typedef boost::gregorian::date_duration type; };  
+
+
+
+    // ------------------------------------------------------------------------
+    boost::gregorian::date operator ++(boost::gregorian::date& x)
+    {
+        return x += boost::gregorian::date::duration_type::unit();
+    }
+
+    boost::gregorian::date operator --(boost::gregorian::date& x)
+    {
+        return x -= boost::gregorian::date::duration_type::unit();
+    }
+
+    // ------------------------------------------------------------------------
+    template<> struct is_discrete<boost::gregorian::date_duration>
+    {
+        typedef is_discrete type;
+        BOOST_STATIC_CONSTANT(bool, value = true);
+    };
+
+    template<> 
+    struct has_difference<boost::gregorian::date_duration> 
+    { 
+        typedef has_difference type;
+        BOOST_STATIC_CONSTANT(bool, value = true);
+    };  
+
+    template<> 
+    struct size_type_of<boost::gregorian::date_duration> 
+    { 
+        typedef boost::gregorian::date_duration type; 
+    };  
+
+    boost::gregorian::date_duration operator ++(boost::gregorian::date_duration& x)
+    {
+        return x += boost::gregorian::date::duration_type::unit();
+    }
+
+    boost::gregorian::date_duration operator --(boost::gregorian::date_duration& x)
+    {
+        return x -= boost::gregorian::date::duration_type::unit();
+    }
+
+    // ------------------------------------------------------------------------
+
+
+}} // namespace icl boost
+
+#endif
+
+