Merge branch 'dt-format-t'

Add forgotten support for %T to our own wxDateTime::Format() code.

See #26180.

interface/wx/datetime.h

@@ -925,7 +925,9 @@ public:
 
         Notice that POSIX @c "%g", @c "%G", @c "%V" and @c "%z" format
         specifiers are supported even if the standard library doesn't support
-        them (e.g. MSVC).
+        them (as is the case when using MinGW, for example), but wxWidgets own
+        implementation is used if any of them are used instead of calling
+        `strftime()`.
 
         It also accepts a few wxWidgets-specific extensions: you can optionally
         specify the width of the field to follow using @c printf(3)-like syntax

src/common/datetimefmt.cpp

@@ -634,6 +634,10 @@ wxString wxDateTime::Format(const wxString& formatp, const TimeZone& tz) const
                     res += wxString::Format(fmt, tm.sec);
                     break;
 
+                case wxT('T'):       // time as %H:%M:%S
+                    res += wxString::Format(wxT("%02d:%02d:%02d"), tm.hour, tm.min, tm.sec);
+                    break;
+
                 case wxT('U'):       // week number in the year (Sunday 1st week day)
                     res += wxString::Format(fmt, GetWeekOfYear(Sunday_First, tz));
                     break;

tests/datetime/datetimetest.cpp

@@ -796,6 +796,10 @@ TEST_CASE("wxDateTime::Format", "[datetime]")
     }
 
     CHECK(wxDateTime::Now().Format("%%") == "%");
+
+
+    wxDateTime dt(29, wxDateTime::May, 1976, 18, 30, 15, 678);
+    CHECK( dt.Format("%F %T.%l") == "1976-05-29 18:30:15.678" );
 }
 
 TEST_CASE("wxDateTime::ParseFormat", "[datetime]")