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diff --git a/storage/mroonga/lib/mrn_time_converter.hpp b/storage/mroonga/lib/mrn_time_converter.hpp
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+++ b/storage/mroonga/lib/mrn_time_converter.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2010-2013 Kentoku SHIBA
+  Copyright(C) 2011-2015 Kouhei Sutou <kou@clear-code.com>
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#ifndef MRN_TIME_CONVERTER_HPP_
+#define MRN_TIME_CONVERTER_HPP_
+
+#include <mrn_mysql_compat.h>
+
+#include <groonga.h>
+
+namespace mrn {
+  class TimeConverter {
+  public:
+    static const long long int TM_YEAR_BASE = 1900;
+
+    TimeConverter();
+    ~TimeConverter();
+
+    long long int mysql_time_to_grn_time(MYSQL_TIME *mysql_time,
+                                         bool *truncated);
+    long long int mysql_datetime_to_grn_time(long long int mysql_datetime,
+                                             bool *truncated);
+
+    long long int tm_to_grn_time(struct tm *time, int usec, bool *truncated);
+
+    void grn_time_to_mysql_time(long long int grn_time, MYSQL_TIME *mysql_time);
+    long long int grn_time_to_mysql_datetime(long long int grn_time);
+
+  private:
+    time_t tm_to_time_gm(struct tm *time, bool *truncated);
+  };
+}
+
+#endif /* MRN_TIME_CONVERTER_HPP_ */