Allow using milliseconds in wxLog timestamp.

Use wxDateTime::UNow() instead of time() and wxDateTime::Format() instead of
localtime() to make it possible to use "%l" specifier in wxLog time stamp.

Closes #13059.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67268 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -451,6 +451,7 @@ All:
 - Added wxStack<> template class.
 - Added precision parameter to wxString::From[C]Double().
 - Added wxThread::Wait() and Delete() "wait mode" parameter (Catalin Raceanu).
+- Allow showing milliseconds in wxLog time stamps (tan).
 
 Unix:
 

src/common/log.cpp

@@ -676,16 +676,8 @@ void wxLog::TimeStamp(wxString *str)
 #if wxUSE_DATETIME
     if ( !ms_timestamp.empty() )
     {
-        wxChar buf[256];
+        *str = wxDateTime::UNow().Format(ms_timestamp);
-        time_t timeNow;
+        *str += wxS(": ");
-        (void)time(&timeNow);
-
-        struct tm tm;
-        wxStrftime(buf, WXSIZEOF(buf),
-                    ms_timestamp, wxLocaltime_r(&timeNow, &tm));
-
-        str->Empty();
-        *str << buf << wxS(": ");
     }
 #endif // wxUSE_DATETIME
 }