Fix for any std::chrono clock

Author: gammasoft71

src/xtd.core/include/xtd/date_time.hpp

@@ -211,19 +211,21 @@ namespace xtd {
 
     /// @brief Initializes a new instance of the xtd::date_time structure to a specified time point.
     /// @param time_point A [std::chrono::time_point](https://en.cppreference.com/w/cpp/chrono/time_point) value.
-    /// @remarks This constructor is used to convert [std::chrono::system_clock::time_point](https://en.cppreference.com/w/cpp/chrono/system_clock) to xtd::date_time.
+    /// @remarks This constructor can be used for example to convert [std::chrono::system_clock::time_point](https://en.cppreference.com/w/cpp/chrono/system_clock) to xtd::date_time.
     template<class clock_t, class duration_t = clock_t::duration> // Can't be explicit by design.
     date_time(const std::chrono::time_point<clock_t, duration_t>& time_point) {
-      *this = from_time_t(clock_t::to_time_t(time_point), date_time_kind::local);
+      using namespace std::chrono;
+      *this = from_time_t(system_clock::to_time_t(system_clock::now() + duration_cast<system_clock::duration>(time_point - clock_t::now())), date_time_kind::local);
     }
 
     /// @brief Initializes a new instance of the xtd::date_time structure to a specified time point, and Coordinated Universal Time (UTC) or local time.
     /// @param time_point A [std::chrono::time_point](https://en.cppreference.com/w/cpp/chrono/time_point) value.
     /// @param kind One of the enumeration values that indicates whether year, month, day, hour, minute and second specify a local time, Coordinated Universal Time (UTC), or neither.
-    /// @remarks This constructor is used to convert [std::chrono::system_clock::time_point](https://en.cppreference.com/w/cpp/chrono/system_clock) to xtd::date_time.
+    /// @remarks This constructor can be used for example to convert [std::chrono::system_clock::time_point](https://en.cppreference.com/w/cpp/chrono/system_clock) to xtd::date_time.
     template<class clock_t, class duration_t = clock_t::duration>
     date_time(const std::chrono::time_point<clock_t, duration_t>& time_point, date_time_kind kind) {
-      *this = from_time_t(clock_t::to_time_t(time_point), kind);
+      using namespace std::chrono;
+      *this = from_time_t(system_clock::to_time_t(system_clock::now() + duration_cast<system_clock::duration>(time_point - clock_t::now())), kind);
     }
     /// @}