Added thirdparty: boost library

thirdparty/include/boost/mysql/days.hpp

@@ -0,0 +1,26 @@
+//
+// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_MYSQL_DAYS_HPP
+#define BOOST_MYSQL_DAYS_HPP
+
+#include <chrono>
+
+namespace boost {
+namespace mysql {
+
+/**
+ * \brief Duration representing a day (24 hours).
+ * \details Suitable to represent the range of dates MySQL offers.
+ * May differ in representation from `std::chrono::days` in C++20.
+ */
+using days = std::chrono::duration<int, std::ratio<3600 * 24>>;
+
+}  // namespace mysql
+}  // namespace boost
+
+#endif