diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/globaltrace/GlobalTraceGetWithGlobalId.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/globaltrace/GlobalTraceGetWithGlobalId.java
index da48921fb..38eee9fa5 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/globaltrace/GlobalTraceGetWithGlobalId.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/globaltrace/GlobalTraceGetWithGlobalId.java
@@ -40,7 +40,7 @@ public class GlobalTraceGetWithGlobalId extends AbstractGet {
         }
         logger.debug("globalId: %s", Arrays.toString(request.get("globalId")));
 
-        String globalId = ParameterTools.toString(request, "globalId");
+        String globalId = ParameterTools.INSTANCE.toString(request, "globalId");
 
         getSelfContext().lookup(GlobalTraceSearchWithGlobalId.WorkerRole.INSTANCE).ask(globalId, response);
     }
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefGetWithTimeSlice.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefGetWithTimeSlice.java
index d7ef9d57d..d02326b7a 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefGetWithTimeSlice.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefGetWithTimeSlice.java
@@ -43,20 +43,20 @@ public class NodeRefGetWithTimeSlice extends AbstractGet {
 
         long startTime;
         try {
-            startTime = Long.valueOf(ParameterTools.toString(request, "startTime"));
+            startTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "startTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter startTime must numeric with long type");
         }
 
         long endTime;
         try {
-            endTime = Long.valueOf(ParameterTools.toString(request, "endTime"));
+            endTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "endTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter endTime must numeric with long type");
         }
 
         NodeRefSearchWithTimeSlice.RequestEntity requestEntity;
-        requestEntity = new NodeRefSearchWithTimeSlice.RequestEntity(ParameterTools.toString(request, "timeSliceType"), startTime, endTime);
+        requestEntity = new NodeRefSearchWithTimeSlice.RequestEntity(ParameterTools.INSTANCE.toString(request, "timeSliceType"), startTime, endTime);
         getSelfContext().lookup(NodeRefSearchWithTimeSlice.WorkerRole.INSTANCE).ask(requestEntity, response);
     }
 
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetGroupWithTimeSlice.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetGroupWithTimeSlice.java
index 3268b7b18..734005b2c 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetGroupWithTimeSlice.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetGroupWithTimeSlice.java
@@ -43,20 +43,20 @@ public class NodeRefResSumGetGroupWithTimeSlice extends AbstractGet {
 
         long startTime;
         try {
-            startTime = Long.valueOf(ParameterTools.toString(request, "startTime"));
+            startTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "startTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter startTime must numeric with long type");
         }
 
         long endTime;
         try {
-            endTime = Long.valueOf(ParameterTools.toString(request, "endTime"));
+            endTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "endTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter endTime must numeric with long type");
         }
 
         NodeRefResSumGroupWithTimeSlice.RequestEntity requestEntity;
-        requestEntity = new NodeRefResSumGroupWithTimeSlice.RequestEntity(ParameterTools.toString(request, "timeSliceType"), startTime, endTime);
+        requestEntity = new NodeRefResSumGroupWithTimeSlice.RequestEntity(ParameterTools.INSTANCE.toString(request, "timeSliceType"), startTime, endTime);
         getSelfContext().lookup(NodeRefResSumGroupWithTimeSlice.WorkerRole.INSTANCE).ask(requestEntity, response);
     }
 
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetWithTimeSlice.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetWithTimeSlice.java
index de025741d..758ddda51 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetWithTimeSlice.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/noderef/NodeRefResSumGetWithTimeSlice.java
@@ -43,20 +43,20 @@ public class NodeRefResSumGetWithTimeSlice extends AbstractGet {
 
         long startTime;
         try {
-            startTime = Long.valueOf(ParameterTools.toString(request, "startTime"));
+            startTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "startTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter startTime must numeric with long type");
         }
 
         long endTime;
         try {
-            endTime = Long.valueOf(ParameterTools.toString(request, "endTime"));
+            endTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "endTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter endTime must numeric with long type");
         }
 
         NodeRefResSumSearchWithTimeSlice.RequestEntity requestEntity;
-        requestEntity = new NodeRefResSumSearchWithTimeSlice.RequestEntity(ParameterTools.toString(request, "timeSliceType"), startTime, endTime);
+        requestEntity = new NodeRefResSumSearchWithTimeSlice.RequestEntity(ParameterTools.INSTANCE.toString(request, "timeSliceType"), startTime, endTime);
         getSelfContext().lookup(NodeRefResSumSearchWithTimeSlice.WorkerRole.INSTANCE).ask(requestEntity, response);
     }
 
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithGlobalTraceId.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithGlobalTraceId.java
index bf19a2d83..f7f0a3746 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithGlobalTraceId.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithGlobalTraceId.java
@@ -43,19 +43,19 @@ public class SegmentTopGetWithGlobalTraceId extends AbstractGet {
 
         int from = 0;
         try {
-            from = Integer.valueOf(ParameterTools.toString(request, "from"));
+            from = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "from"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter from must numeric with int type");
         }
 
         int limit = 0;
         try {
-            limit = Integer.valueOf(ParameterTools.toString(request, "limit"));
+            limit = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "limit"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter from must numeric with int type");
         }
 
-        String globalTraceId = ParameterTools.toString(request, "globalTraceId");
+        String globalTraceId = ParameterTools.INSTANCE.toString(request, "globalTraceId");
 
         SegmentTopSearchWithGlobalTraceId.RequestEntity requestEntity = new SegmentTopSearchWithGlobalTraceId.RequestEntity(globalTraceId, from, limit);
         getSelfContext().lookup(SegmentTopSearchWithGlobalTraceId.WorkerRole.INSTANCE).ask(requestEntity, response);
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithTimeSlice.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithTimeSlice.java
index 999685f0e..b363f0640 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithTimeSlice.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/segment/SegmentTopGetWithTimeSlice.java
@@ -43,39 +43,39 @@ public class SegmentTopGetWithTimeSlice extends AbstractGet {
 
         long startTime;
         try {
-            startTime = Long.valueOf(ParameterTools.toString(request, "startTime"));
+            startTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "startTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter startTime must numeric with long type");
         }
 
         long endTime;
         try {
-            endTime = Long.valueOf(ParameterTools.toString(request, "endTime"));
+            endTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "endTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter endTime must numeric with long type");
         }
 
         int from = 0;
         try {
-            from = Integer.valueOf(ParameterTools.toString(request, "from"));
+            from = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "from"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter from must numeric with int type");
         }
 
         int limit = 0;
         try {
-            limit = Integer.valueOf(ParameterTools.toString(request, "limit"));
+            limit = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "limit"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter from must numeric with int type");
         }
 
         int minCost = -1;
         if (request.containsKey("minCost")) {
-            minCost = Integer.valueOf(ParameterTools.toString(request, "minCost"));
+            minCost = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "minCost"));
         }
         int maxCost = -1;
         if (request.containsKey("maxCost")) {
-            maxCost = Integer.valueOf(ParameterTools.toString(request, "maxCost"));
+            maxCost = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "maxCost"));
         }
 
         SegmentTopSearchWithTimeSlice.RequestEntity requestEntity;
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/span/SpanGetWithId.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/span/SpanGetWithId.java
index e90f5c737..e5ff6cf99 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/span/SpanGetWithId.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/span/SpanGetWithId.java
@@ -42,11 +42,11 @@ public class SpanGetWithId extends AbstractGet {
 
         int maxCost = -1;
         if (request.containsKey("maxCost")) {
-            maxCost = Integer.valueOf(ParameterTools.toString(request, "maxCost"));
+            maxCost = Integer.valueOf(ParameterTools.INSTANCE.toString(request, "maxCost"));
         }
 
-        String segId = ParameterTools.toString(request, "segId");
-        String spanId = ParameterTools.toString(request, "spanId");
+        String segId = ParameterTools.INSTANCE.toString(request, "segId");
+        String spanId = ParameterTools.INSTANCE.toString(request, "spanId");
 
         SpanSearchWithId.RequestEntity requestEntity = new SpanSearchWithId.RequestEntity(segId, spanId);
         getSelfContext().lookup(SpanSearchWithId.WorkerRole.INSTANCE).ask(requestEntity, response);
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/DateTools.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/DateTools.java
index fc01051e9..c5fcff2ca 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/DateTools.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/DateTools.java
@@ -41,7 +41,9 @@ public class DateTools {
     }
 
     public static long changeToUTCSlice(long timeSlice) {
-        if (TimeZone.getDefault().getID().equals("GMT+08:00")) {
+        String timeSliceStr = String.valueOf(timeSlice);
+
+        if (TimeZone.getDefault().getID().equals("GMT+08:00") || timeSliceStr.endsWith("0000")) {
             return timeSlice;
         } else {
             return timeSlice - 800;
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/ParameterTools.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/ParameterTools.java
index 9301440db..d80458c4d 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/ParameterTools.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/ParameterTools.java
@@ -5,9 +5,10 @@ import java.util.Map;
 /**
  * @author pengys5
  */
-public class ParameterTools {
+public enum ParameterTools {
+    INSTANCE;
 
-    public static String toString(Map<String, String[]> request, String key) {
+    public String toString(Map<String, String[]> request, String key) {
         if (request.get(key) != null) {
             return request.get(key)[0];
         } else {
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tracedag/TraceDagGetWithTimeSlice.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tracedag/TraceDagGetWithTimeSlice.java
index 41e1d317d..28cfac4f2 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tracedag/TraceDagGetWithTimeSlice.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tracedag/TraceDagGetWithTimeSlice.java
@@ -50,19 +50,19 @@ public class TraceDagGetWithTimeSlice extends AbstractGet {
 
         long startTime;
         try {
-            startTime = Long.valueOf(ParameterTools.toString(request, "startTime"));
+            startTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "startTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter startTime must numeric with long type");
         }
 
         long endTime;
         try {
-            endTime = Long.valueOf(ParameterTools.toString(request, "endTime"));
+            endTime = Long.valueOf(ParameterTools.INSTANCE.toString(request, "endTime"));
         } catch (NumberFormatException e) {
             throw new IllegalArgumentException("the request parameter endTime must numeric with long type");
         }
 
-        String timeSliceType = ParameterTools.toString(request, "timeSliceType");
+        String timeSliceType = ParameterTools.INSTANCE.toString(request, "timeSliceType");
 
         JsonObject compResponse = new JsonObject();
         getSelfContext().lookup(NodeCompLoad.WorkerRole.INSTANCE).ask(null, compResponse);
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/HttpClientTools.java b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/HttpClientTools.java
similarity index 98%
rename from skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/HttpClientTools.java
rename to skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/HttpClientTools.java
index 84d0d0530..ce28e6729 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/tools/HttpClientTools.java
+++ b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/HttpClientTools.java
@@ -1,4 +1,4 @@
-package com.a.eye.skywalking.collector.worker.tools;
+package com.a.eye.skywalking.collector.worker.segment;
 
 import org.apache.http.Consts;
 import org.apache.http.HttpEntity;
diff --git a/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/SegmentRealPost.java b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/SegmentRealPost.java
index 90aa41ad7..f0c6cfdeb 100644
--- a/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/SegmentRealPost.java
+++ b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/segment/SegmentRealPost.java
@@ -1,7 +1,6 @@
 package com.a.eye.skywalking.collector.worker.segment;
 
 import com.a.eye.skywalking.collector.worker.segment.mock.SegmentMock;
-import com.a.eye.skywalking.collector.worker.tools.HttpClientTools;
 
 /**
  * @author pengys5
diff --git a/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/tools/ParameterToolsTestCase.java b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/tools/ParameterToolsTestCase.java
new file mode 100644
index 000000000..7efbf3874
--- /dev/null
+++ b/skywalking-collector/skywalking-collector-worker/src/test/java/com/a/eye/skywalking/collector/worker/tools/ParameterToolsTestCase.java
@@ -0,0 +1,24 @@
+package com.a.eye.skywalking.collector.worker.tools;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author pengys5
+ */
+public class ParameterToolsTestCase {
+
+    @Test
+    public void testToString() {
+        Map<String, String[]> request = new HashMap<>();
+        String[] test = {"Test"};
+
+        request.put("Key", test);
+
+        String value = ParameterTools.INSTANCE.toString(request, "Key");
+        Assert.assertEquals("Test", value);
+    }
+}