fix assert when the control doesn't have a valid date initially (bug 1648192)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44347 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/msw/datectrl.cpp b/src/msw/datectrl.cpp
index 438f34769407e1e9825ad3ce2445b6a60d058182..d6a4315352a4fee867516a4ca68921e9630e5aa8 100644 (file)
--- a/src/msw/datectrl.cpp
+++ b/src/msw/datectrl.cpp
@@ -259,7 +259,8 @@ void wxDatePickerCtrl::SetValue(const wxDateTime& dt)
     // we need to keep only the date part, times don't make sense for this
     // control (in particular, comparisons with other dates would fail)
     m_date = dt;
-    m_date.ResetTime();
+    if ( m_date.IsValid() )
+        m_date.ResetTime();
 }
 
 wxDateTime wxDatePickerCtrl::GetValue() const