Added wxTimePickerCtrl::GetTime() and SetTime().

These methods, taking broken down time representation, avoid the problems
arising due to DST complications when using wxDateTime to represent the time
as special care needs to be taken in this case to avoid using the date part
corresponding to a DST change date at which time is discontinuous.

Document the problem with the old functions and use the new ones in the
sample.

See #14137.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71004 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/timectrl.h

@@ -88,6 +88,18 @@ public:
                 const wxValidator& validator = wxDefaultValidator,
                 const wxString& name = "timectrl");
 
+    /**
+        Returns the currently entered time as hours, minutes and seconds.
+
+        All the arguments must be non-@NULL, @false is returned otherwise and
+        none of them is modified.
+
+        @see SetTime()
+
+        @since 2.9.4
+     */
+    bool GetTime(int* hour, int* min, int* sec) const;
+
     /**
         Returns the currently entered time.
 
@@ -96,12 +108,38 @@ public:
     */
     virtual wxDateTime GetValue() const = 0;
 
+    /**
+        Changes the current time of the control.
+
+        Calling this method does not result in a time change event.
+
+        @param hour The new hour value in 0..23 interval.
+        @param min The new minute value in 0..59 interval.
+        @param sec The new second value in 0..59 interval.
+        @return @true if the time was changed or @false on failure, e.g. if the
+            time components were invalid.
+
+        @see GetTime()
+
+        @since 2.9.4
+     */
+    bool SetTime(int hour, int min, int sec);
+
     /**
         Changes the current value of the control.
 
         The date part of @a dt is ignored, only the time part is displayed in
         the control. The @a dt object must however be valid.
 
+        In particular notice that it is a bad idea to use default wxDateTime
+        constructor from hour, minute and second values as it uses the today
+        date for the date part which means that some times can be invalid if
+        today happens to be the day of DST change. For example, when switching
+        to summer time the time 2:00 typically doesn't exist as the clocks jump
+        directly to 3:00. To avoid this problem, use a fixed date on which DST
+        is known not to change (e.g. Jan 1, 2012) for the date part of the
+        argument or use SetTime().
+
         Calling this method does not result in a time change event.
     */
     virtual void SetValue(const wxDateTime& dt) = 0;