diff --git a/src/main/java/com/datadoghq/trace/impl/DDSpan.java b/src/main/java/com/datadoghq/trace/impl/DDSpan.java
index ee5bcd5fc2..3118db6556 100644
--- a/src/main/java/com/datadoghq/trace/impl/DDSpan.java
+++ b/src/main/java/com/datadoghq/trace/impl/DDSpan.java
@@ -46,31 +46,30 @@ public class DDSpan implements io.opentracing.Span {
         if (this.context.getServiceName() == null) {
             throw new IllegalArgumentException("No ServiceName provided");
         }
-
-        logger.debug("Starting a new span. " + this.toString());
-
     }
 
     public void finish(long stopTimeMillis) {
 
-        // formula: millis(stop - start) * 1000 * 1000 + nano(stop - start)
+        // formula: millis(stop - start) * 1000 * 1000 + keepNano(nano(stop - start))
         long stopTimeNano = System.nanoTime();
-        this.durationNano = (stopTimeMillis - startTime) * 1000000L + (stopTimeNano - this.startTimeNano);
+        this.durationNano = (stopTimeMillis - startTime) * 1000000L + ((stopTimeNano - this.startTimeNano) % 1000000L);
 
-        logger.debug("Finishing the span." + this.toString());
+        logger.debug("SPAN" + this.getSpanId() + " - Closing the span." + this.toString());
 
         // warn if one of the parent's children is not finished
         if (this.isRootSpan()) {
-            logger.debug("Checking all children attached to the current root span");
+            logger.debug("SPAN" + this.getSpanId() + " - The current span is marked as a root span");
             List<Span> spans = this.context.getTrace();
+            logger.debug("SPAN" + this.getSpanId() + " - Checking " + spans.size() + " children attached to the current span");
+
             for (Span span : spans) {
                 if (((DDSpan) span).getDurationNano() == 0L) {
                     // FIXME
-                    logger.warn("The parent span is marked as finished but this span isn't. You have to close each children." + this.toString());
+                    logger.warn("SPAN" + this.getSpanId() + " - The parent span is marked as finished but this span isn't. You have to close each children." + this.toString());
                 }
             }
             this.context.getTracer().write(this.context.getTrace());
-            logger.debug("Sending the trace to the writer");
+            logger.debug("SPAN" + this.getSpanId() + " - Sending the trace to the writer");
 
         }
 
@@ -164,7 +163,7 @@ public class DDSpan implements io.opentracing.Span {
 
     @JsonGetter(value = "start")
     public long getStartTime() {
-        return startTimeNano;
+        return startTime * 1000000L;
     }
 
     @JsonGetter(value = "duration")
diff --git a/src/main/java/com/datadoghq/trace/impl/DDTracer.java b/src/main/java/com/datadoghq/trace/impl/DDTracer.java
index 42034f6536..937a087023 100644
--- a/src/main/java/com/datadoghq/trace/impl/DDTracer.java
+++ b/src/main/java/com/datadoghq/trace/impl/DDTracer.java
@@ -58,15 +58,11 @@ public class DDTracer implements io.opentracing.Tracer {
 
             // build the context
             DDSpanContext context = buildTheSpanContext();
+            Span span = new DDSpan(this.operationName, this.tags, this.timestamp, context);
 
-            // FIXME
-            logger.debug("Starting new span " + this.operationName);
+            logger.debug("Starting a new span. " + span.toString());
 
-            return new DDSpan(
-                    this.operationName,
-                    this.tags,
-                    this.timestamp,
-                    context);
+            return span;
         }
 
         public DDTracer.DDSpanBuilder withTag(String tag, Number number) {
@@ -165,7 +161,7 @@ public class DDTracer implements io.opentracing.Tracer {
                     DDTracer.this
             );
 
-            logger.debug("Building a new span context." + context.toString());
+            logger.debug("Building a new span context. " + context.toString());
 
             return context;
         }