Updated Boost datetime Examples Translated (markdown)

Boost-datetime-Examples-Translated.md

@@ -342,7 +342,7 @@ main()
 ```
 <a name="Time_Math"></a>
 ### Time Math
-
+```c++
 #include "date.h"
 #include <iostream>
 
@@ -352,17 +352,17 @@ main()
     using namespace std::chrono;
     using namespace date;
 
-        auto d = sys_days(2002_y/feb/1);  // an arbitrary date;
+    auto d = sys_days{2002_y/feb/1};  // an arbitrary date;
     // construct a time by adding up some durations durations
     auto t1 = d + 5h + 4min + 2s + 1ms;
     // construct a new time by subtracting some times
     auto t2 = t1 - 5h - 4min - 2s - 1ms;
     // construct a duration by taking the difference between times
     auto td = t2 - t1;
-        std::cout << t2 << " - " << t1 << " = " << make_time(td) << '\n';
+    std::cout << t2 << " - " << t1 << " = " << format("%T\n", td);
     // 2002-02-01 00:00:00.000 - 2002-02-01 05:04:02.001 = -05:04:02.001
 }
-
+```
 <a name="Print_Hours"></a>
 ### Print Hours