diff --git a/htrace-core4/src/main/java/org/apache/htrace/core/MilliSpan.java b/htrace-core4/src/main/java/org/apache/htrace/core/MilliSpan.java
index 5dd6bdb8..04f5f27d 100644
--- a/htrace-core4/src/main/java/org/apache/htrace/core/MilliSpan.java
+++ b/htrace-core4/src/main/java/org/apache/htrace/core/MilliSpan.java
@@ -51,7 +51,9 @@ public class MilliSpan implements Span {
   private static final String EMPTY_STRING = "";
 
   private long begin;
+  private long beginNano;
   private long end;
+  private long endNano;
   private final String description;
   private SpanId parents[];
   private final SpanId spanId;
@@ -62,8 +64,8 @@ public class MilliSpan implements Span {
   @Override
   public Span child(String childDescription) {
     return new MilliSpan.Builder().
-      begin(System.currentTimeMillis()).
-      end(0).
+      begin(System.currentTimeMillis(),System.nanoTime()).
+      end(0,0).
       description(childDescription).
       parents(new SpanId[] {spanId}).
       spanId(spanId.newChildId()).
@@ -76,7 +78,9 @@ public Span child(String childDescription) {
    */
   public static class Builder {
     private long begin;
+    private long beginNano;
     private long end;
+    private long endNano;
     private String description = EMPTY_STRING;
     private SpanId parents[] = EMPTY_PARENT_ARRAY;
     private SpanId spanId = SpanId.INVALID;
@@ -87,13 +91,25 @@ public static class Builder {
     public Builder() {
     }
 
-    public Builder begin(long begin) {
+    public Builder begin(long begin){
       this.begin = begin;
       return this;
     }
 
-    public Builder end(long end) {
+    public Builder begin(long begin, long beginNano) {
+      this.begin = begin;
+      this.beginNano = beginNano;
+      return this;
+    }
+
+    public Builder end(long end){
+      this.end = end;
+      return this;
+    }
+
+    public Builder end(long end, long endNano) {
       this.end = end;
+      this.endNano = endNano;
       return this;
     }
 
@@ -143,7 +159,9 @@ public MilliSpan build() {
 
   public MilliSpan() {
     this.begin = 0;
+    this.beginNano = 0;
     this.end = 0;
+    this.endNano = 0;
     this.description = EMPTY_STRING;
     this.parents = EMPTY_PARENT_ARRAY;
     this.spanId = SpanId.INVALID;
@@ -155,6 +173,8 @@ public MilliSpan() {
   private MilliSpan(Builder builder) {
     this.begin = builder.begin;
     this.end = builder.end;
+    this.beginNano = builder.beginNano;
+    this.endNano = builder.endNano;
     this.description = builder.description;
     this.parents = builder.parents;
     this.spanId = builder.spanId;
@@ -170,6 +190,7 @@ public synchronized void stop() {
         throw new IllegalStateException("Span for " + description
             + " has not been started");
       end = System.currentTimeMillis();
+      endNano = System.nanoTime();
     }
   }
 
@@ -287,11 +308,11 @@ public MilliSpan deserialize(JsonParser jp, DeserializationContext ctxt)
       Builder builder = new Builder();
       JsonNode bNode = root.get("b");
       if (bNode != null) {
-        builder.begin(bNode.asLong());
+        builder.begin(bNode.asLong(),bNode.asLong());
       }
       JsonNode eNode = root.get("e");
       if (eNode != null) {
-        builder.end(eNode.asLong());
+        builder.end(eNode.asLong(),eNode.asLong());
       }
       JsonNode dNode = root.get("d");
       if (dNode != null) {
@@ -344,4 +365,14 @@ public MilliSpan deserialize(JsonParser jp, DeserializationContext ctxt)
   public static MilliSpan fromJson(String json) throws IOException {
     return JSON_READER.readValue(json);
   }
+
+  @Override
+  public long getStartTimeNanos() {
+    return beginNano;
+  }
+
+  @Override
+  public long getStopTimeNanos() {
+    return endNano;
+  }
 }
diff --git a/htrace-core4/src/main/java/org/apache/htrace/core/Span.java b/htrace-core4/src/main/java/org/apache/htrace/core/Span.java
index 43992599..9a58b9ca 100644
--- a/htrace-core4/src/main/java/org/apache/htrace/core/Span.java
+++ b/htrace-core4/src/main/java/org/apache/htrace/core/Span.java
@@ -48,6 +48,13 @@ public interface Span {
    */
   long getStartTimeMillis();
 
+  /**
+   * Get the span start time.
+   *
+   * @return    The start time, in approximate nanoseconds since the epoch.
+   */
+  long getStartTimeNanos();
+
   /**
    * Get the span stop time.
    *
@@ -55,6 +62,13 @@ public interface Span {
    */
   long getStopTimeMillis();
 
+  /**
+   * Get the span stop time.
+   *
+   * @return    The stop time, in approximate nanoseconds since the epoch.
+   */
+  long getStopTimeNanos();
+
   /**
    * Return the total amount of time elapsed since start was called, if running,
    * or difference between stop and start
@@ -176,9 +190,15 @@ public void serialize(Span span, JsonGenerator jgen, SerializerProvider provider
       if (span.getStartTimeMillis() != 0) {
         jgen.writeNumberField("b", span.getStartTimeMillis());
       }
+      if(span.getStartTimeNanos() != 0){
+        jgen.writeNumberField("k", span.getStartTimeNanos());
+      }
       if (span.getStopTimeMillis() != 0) {
         jgen.writeNumberField("e", span.getStopTimeMillis());
       }
+      if(span.getStopTimeNanos() != 0){
+        jgen.writeNumberField("l",span.getStopTimeNanos());
+      }
       if (!span.getDescription().isEmpty()) {
         jgen.writeStringField("d", span.getDescription());
       }
diff --git a/htrace-core4/src/main/java/org/apache/htrace/core/Tracer.java b/htrace-core4/src/main/java/org/apache/htrace/core/Tracer.java
index f78e0a08..41489a7c 100644
--- a/htrace-core4/src/main/java/org/apache/htrace/core/Tracer.java
+++ b/htrace-core4/src/main/java/org/apache/htrace/core/Tracer.java
@@ -313,7 +313,7 @@ public String getTracerId() {
   private TraceScope newScopeImpl(ThreadContext context, String description) {
     Span span = new MilliSpan.Builder().
         tracerId(tracerId).
-        begin(System.currentTimeMillis()).
+        begin(System.currentTimeMillis(),System.nanoTime()).
         description(description).
         parents(EMPTY_PARENT_ARRAY).
         spanId(SpanId.fromRandom()).
@@ -326,7 +326,7 @@ private TraceScope newScopeImpl(ThreadContext context, String description,
     SpanId parentId = parentScope.getSpan().getSpanId();
     Span span = new MilliSpan.Builder().
         tracerId(tracerId).
-        begin(System.currentTimeMillis()).
+        begin(System.currentTimeMillis(),System.nanoTime()).
         description(description).
         parents(new SpanId[] { parentId }).
         spanId(parentId.newChildId()).
@@ -338,7 +338,7 @@ private TraceScope newScopeImpl(ThreadContext context, String description,
         SpanId parentId) {
     Span span = new MilliSpan.Builder().
         tracerId(tracerId).
-        begin(System.currentTimeMillis()).
+        begin(System.currentTimeMillis(),System.nanoTime()).
         description(description).
         parents(new SpanId[] { parentId }).
         spanId(parentId.newChildId()).
@@ -351,7 +351,7 @@ private TraceScope newScopeImpl(ThreadContext context, String description,
     SpanId parentId = parentScope.getSpan().getSpanId();
     Span span = new MilliSpan.Builder().
         tracerId(tracerId).
-        begin(System.currentTimeMillis()).
+        begin(System.currentTimeMillis(),System.nanoTime()).
         description(description).
         parents(new SpanId[] { parentId, secondParentId }).
         spanId(parentId.newChildId()).
diff --git a/htrace-hbase/src/test/java/org/apache/htrace/impl/TestHBaseSpanReceiver.java b/htrace-hbase/src/test/java/org/apache/htrace/impl/TestHBaseSpanReceiver.java
index bba19f54..d380e47e 100644
--- a/htrace-hbase/src/test/java/org/apache/htrace/impl/TestHBaseSpanReceiver.java
+++ b/htrace-hbase/src/test/java/org/apache/htrace/impl/TestHBaseSpanReceiver.java
@@ -193,6 +193,18 @@ public long getStopTimeMillis() {
       return span.getStop();
     }
 
+    @Override
+    public long getStartTimeNanos() {
+      //TO DO: add nano support
+      return 0;
+    }
+
+    @Override
+    public long getStopTimeNanos() {
+      //TO DO : add nano support
+      return 0;
+    }
+
     @Override
     public SpanId getSpanId() {
       return new SpanId(span.getTraceId(), span.getSpanId());