diff --git a/core/api/src/main/java/org/onlab/onos/event/AbstractEvent.java b/core/api/src/main/java/org/onlab/onos/event/AbstractEvent.java
index cc4735d..0fc8eaa 100644
--- a/core/api/src/main/java/org/onlab/onos/event/AbstractEvent.java
+++ b/core/api/src/main/java/org/onlab/onos/event/AbstractEvent.java
@@ -17,6 +17,8 @@
 
 import static com.google.common.base.MoreObjects.toStringHelper;
 
+import org.joda.time.LocalDateTime;
+
 /**
  * Base event implementation.
  */
@@ -67,8 +69,11 @@
 
     @Override
     public String toString() {
-        return toStringHelper(this).add("time", time).add("type", type())
-                .add("subject", subject()).toString();
+        return toStringHelper(this)
+                .add("time", new LocalDateTime(time))
+                .add("type", type())
+                .add("subject", subject())
+                .toString();
     }
 
 }
diff --git a/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java b/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
index 74f8161..1aecfb4 100644
--- a/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
+++ b/core/api/src/main/java/org/onlab/onos/mastership/MastershipEvent.java
@@ -15,6 +15,7 @@
  */
 package org.onlab.onos.mastership;
 
+import org.joda.time.LocalDateTime;
 import org.onlab.onos.cluster.RoleInfo;
 import org.onlab.onos.event.AbstractEvent;
 import org.onlab.onos.net.DeviceId;
@@ -83,7 +84,7 @@
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(getClass())
-                .add("time", time())
+                .add("time", new LocalDateTime(time()))
                 .add("type", type())
                 .add("subject", subject())
                 .add("roleInfo", roleInfo)
diff --git a/core/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
index eccc14d..7fa981e 100644
--- a/core/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
@@ -15,6 +15,7 @@
  */
 package org.onlab.onos.net.device;
 
+import org.joda.time.LocalDateTime;
 import org.onlab.onos.event.AbstractEvent;
 import org.onlab.onos.net.Device;
 import org.onlab.onos.net.Port;
@@ -131,7 +132,11 @@
         if (port == null) {
             return super.toString();
         }
-        return toStringHelper(this).add("time", time()).add("type", type())
-            .add("subject", subject()).add("port", port).toString();
+        return toStringHelper(this)
+                .add("time", new LocalDateTime(time()))
+                .add("type", type())
+                .add("subject", subject())
+                .add("port", port)
+                .toString();
      }
 }