From d2a02746c696445892fffbaae40a8495a99a37fe Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 24 Oct 2012 14:02:30 +0000
Subject: [PATCH] Make wxDateTime invalid after Set((time_t)-1) call.

Closes #14776.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72750 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/datetime.h   | 13 ++++++++++---
 interface/wx/datetime.h |  3 +++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/wx/datetime.h b/include/wx/datetime.h
index f6bb9cd..5b68047 100644
--- a/include/wx/datetime.h
+++ b/include/wx/datetime.h
@@ -1781,9 +1781,16 @@ inline wxDateTime wxDateTime::Today()
 #if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
 inline wxDateTime& wxDateTime::Set(time_t timet)
 {
-    // assign first to avoid long multiplication overflow!
-    m_time = timet - WX_TIME_BASE_OFFSET ;
-    m_time *= TIME_T_FACTOR;
+    if ( timet == (time_t)-1 )
+    {
+        m_time = wxInvalidDateTime.m_time;
+    }
+    else
+    {
+        // assign first to avoid long multiplication overflow!
+        m_time = timet - WX_TIME_BASE_OFFSET;
+        m_time *= TIME_T_FACTOR;
+    }
 
     return *this;
 }
diff --git a/interface/wx/datetime.h b/interface/wx/datetime.h
index 01ef279..9c07d39 100644
--- a/interface/wx/datetime.h
+++ b/interface/wx/datetime.h
@@ -483,6 +483,9 @@ public:
     /**
         Constructs the object from @a timet value holding the number of seconds
         since Jan 1, 1970.
+
+        If @a timet is invalid, i.e. @code (time_t)-1 @endcode, wxDateTime
+        becomes invalid too, i.e. its IsValid() will return @false.
     */
     wxDateTime& Set(time_t timet);
     /**
-- 
2.7.4