Show more information if DateTimeTestCase::TestTimeFormat() fails

No real changes, just show the variable values if any checks fail and
also continue running the test for the other data points even if one of
them fails.

tests/datetime/datetimetest.cpp

@@ -665,6 +665,15 @@ void DateTimeTestCase::TestTimeFormat()
         CompareTime         // time only
     };
 
+    const char* const compareKindStrings[] =
+    {
+        "nothing",
+        "both date and time",
+        "both date and time but without century",
+        "only dates",
+        "only times",
+    };
+
     static const struct
     {
         CompareKind compareKind;
@@ -785,13 +794,16 @@ void DateTimeTestCase::TestTimeFormat()
                     if ( !strstr(fmt, "%z") && !isLocalTz )
                         dt2.MakeFromTimezone(tz);
 
+                    INFO("Comparing " << compareKindStrings[kind] << " for "
+                            << dt << " with " << dt2
+                            << " (format result=\"" << s << "\")");
+
                     switch ( kind )
                     {
                         case CompareYear:
                             if ( dt2.GetCentury() != dt.GetCentury() )
                             {
-                                CPPUNIT_ASSERT_EQUAL(dt.GetYear() % 100,
+                                CHECK( dt.GetYear() % 100 == dt2.GetYear() % 100);
-                                                     dt2.GetYear() % 100);
 
                                 dt2.SetYear(dt.GetYear());
                             }
@@ -799,15 +811,15 @@ void DateTimeTestCase::TestTimeFormat()
                             wxFALLTHROUGH;
 
                         case CompareBoth:
-                            CPPUNIT_ASSERT_EQUAL( dt, dt2 );
+                            CHECK( dt == dt2 );
                             break;
 
                         case CompareDate:
-                            CPPUNIT_ASSERT( dt.IsSameDate(dt2) );
+                            CHECK( dt.IsSameDate(dt2) );
                             break;
 
                         case CompareTime:
-                            CPPUNIT_ASSERT( dt.IsSameTime(dt2) );
+                            CHECK( dt.IsSameTime(dt2) );
                             break;
 
                         case CompareNone: