1 files changed, 21 insertions, 6 deletions
diff --git a/util.cpp b/util.cpp
index 8f06e30870..2be841d07c 100644
--- a/util.cpp
+++ b/util.cpp
@@ -14,6 +14,7 @@ char pszSetDataDir[MAX_PATH] = "";
 bool fShutdown = false;
 bool fDaemon = false;
 bool fCommandLine = false;
+string strWarning;
 
 
 
@@ -742,14 +743,28 @@ void AddTimeData(unsigned int ip, int64 nTime)
     {
         sort(vTimeOffsets.begin(), vTimeOffsets.end());
         int64 nMedian = vTimeOffsets[vTimeOffsets.size()/2];
-        nTimeOffset = nMedian;
-        if ((nMedian > 0 ? nMedian : -nMedian) > 70 * 60)
+        // Only let other nodes change our time by so much
+        if (abs64(nMedian) < 70 * 60)
+        {
+            nTimeOffset = nMedian;
+        }
+        else
         {
-            // Only let other nodes change our clock so far before we
-            // go to the NTP servers
-            /// todo: Get time from NTP servers, then set a flag
-            ///    to make sure it doesn't get changed again
             nTimeOffset = 0;
+            // If nobody else has the same time as us, give a warning
+            bool fMatch = false;
+            foreach(int64 nOffset, vTimeOffsets)
+                if (nOffset != 0 && abs64(nOffset) < 10 * 60)
+                    fMatch = true;
+            static bool fDone;
+            if (!fMatch && !fDone)
+            {
+                fDone = true;
+                string strMessage = _("Warning: Check your system date and time, you may not be able to generate or receive the most recent blocks!");
+                strWarning = strMessage;
+                printf("*** %s\n", strMessage.c_str());
+                boost::thread(bind(ThreadSafeMessageBox, strMessage+" ", string("Bitcoin"), wxOK | wxICON_EXCLAMATION, (wxWindow*)NULL, -1, -1));
+            }
         }
         foreach(int64 n, vTimeOffsets)
             printf("%+"PRI64d"  ", n);