Fix DateTime::GetDate calculations

#2089 #2086

Source/Engine/Tests/TestTime.cpp

@@ -0,0 +1,26 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#include "Engine/Core/Types/DateTime.h"
+#include <ThirdParty/catch2/catch.hpp>
+
+TEST_CASE("DateTime")
+{
+    SECTION("Test Convertion")
+    {
+        constexpr int year = 2023;
+        constexpr int month = 12;
+        constexpr int day = 16;
+        constexpr int hour = 23;
+        constexpr int minute = 50;
+        constexpr int second = 13;
+        constexpr int millisecond = 5;
+        const DateTime dt1(year, month, day, hour, minute, second, millisecond);
+        CHECK(dt1.GetYear() == year);
+        CHECK(dt1.GetMonth() == month);
+        CHECK(dt1.GetDay() == day);
+        CHECK(dt1.GetHour() == hour);
+        CHECK(dt1.GetMinute() == minute);
+        CHECK(dt1.GetSecond() == second);
+        CHECK(dt1.GetMillisecond() == millisecond);
+    }
+}