diff --git a/apps/routerconsole/java/src/net/i2p/router/web/SummaryRenderer.java b/apps/routerconsole/java/src/net/i2p/router/web/SummaryRenderer.java
index 9644b8e3f..06d6e9af5 100644
--- a/apps/routerconsole/java/src/net/i2p/router/web/SummaryRenderer.java
+++ b/apps/routerconsole/java/src/net/i2p/router/web/SummaryRenderer.java
@@ -109,7 +109,8 @@ class SummaryRenderer {
     public void render(OutputStream out, int width, int height, boolean hideLegend, boolean hideGrid,
                        boolean hideTitle, boolean showEvents, int periodCount,
                        int endp, boolean showCredit, SummaryListener lsnr2, String titleOverride) throws IOException {
-        long end = _listener.now() - 75*1000;
+        // prevent NaNs if we are skewed ahead of system time
+        long end = Math.min(_listener.now(), System.currentTimeMillis()) - 75*1000;
         long period = _listener.getRate().getPeriod();
         if (endp > 0)
             end -= period * endp;
diff --git a/history.txt b/history.txt
index b18039cfe..f538cacb3 100644
--- a/history.txt
+++ b/history.txt
@@ -1,3 +1,13 @@
+2015-05-27 zzz
+ * Banlist: Ban all-zero hash
+ * DataHelper: Add year output to formatDuration()
+ * Graphs: prevent NaNs if we are skewed ahead of system time
+ * NetDb: Drop all-zero lookups and stores, add stats
+ * SSU:
+   - Fix debug logging of dumped packets
+   - Drop sessions with bad clock skew, banlist peer, add stats
+   - Drop sessions with corrupt DSM, banlist peer, add stats
+
 2015-05-23 zzz
  * I2CP: Add an INIT state for session, so a newly created session
    isn't treated as CLOSED and immediately replaced by i2ptunnel,
diff --git a/router/java/src/net/i2p/router/RouterVersion.java b/router/java/src/net/i2p/router/RouterVersion.java
index 5fd579e05..a06babd51 100644
--- a/router/java/src/net/i2p/router/RouterVersion.java
+++ b/router/java/src/net/i2p/router/RouterVersion.java
@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 30;
+    public final static long BUILD = 31;
 
     /** for example "-test" */
     public final static String EXTRA = "-rc";