diff --git a/g/database/gkafka/gkafka.go b/g/database/gkafka/gkafka.go
index 4f85044c0..54e42cad1 100644
--- a/g/database/gkafka/gkafka.go
+++ b/g/database/gkafka/gkafka.go
@@ -15,6 +15,13 @@ import (
     "gitee.com/johng/gf/g/os/glog"
 )
 
+var (
+    // 当使用Topics方法获取所有topic后，进行过滤忽略的topic，多个以','号分隔
+    ignoreTopics = map[string]bool {
+        "__consumer_offsets" : true,
+    }
+)
+
 // kafka Client based on sarama.Config
 type Config struct {
     GroupId        string // group id for consumer.
@@ -93,7 +100,16 @@ func (client *Client) Topics() ([]string, error) {
             client.rawConsumer = c
         }
     }
-    return client.rawConsumer.Topics()
+    if topics, err := client.rawConsumer.Topics(); err == nil {
+        for k, v := range topics {
+            if _, ok := ignoreTopics[v]; ok {
+                topics = append(topics[ : k], topics[k + 1 : ]...)
+            }
+        }
+        return topics, nil
+    } else {
+        return nil, err
+    }
 }
 
 // Receive message from kafka from specified topics in config, in BLOCKING way, gkafka will handle offset tracking automatically.
diff --git a/g/os/gtime/gtime.go b/g/os/gtime/gtime.go
index 79869ab14..889e62e3b 100644
--- a/g/os/gtime/gtime.go
+++ b/g/os/gtime/gtime.go
@@ -125,6 +125,9 @@ func StrToTime(str string, format...string) (time.Time, error) {
             }
         }
         // 如果字符串中有时区信息，那么执行时区转换，将时区转成UTC
+        if match[4] != "" && match[6] == "" {
+            match[6] = "000000"
+        }
         if match[6] != "" {
             zone := strings.Replace(match[6], ":", "", -1)
             zone  = strings.TrimLeft(zone, "+-")
diff --git a/geg/util/gtime/gtime1.go b/geg/os/gtime/gtime1.go
similarity index 95%
rename from geg/util/gtime/gtime1.go
rename to geg/os/gtime/gtime1.go
index 80f982462..f4ba82bd0 100644
--- a/geg/util/gtime/gtime1.go
+++ b/geg/os/gtime/gtime1.go
@@ -16,6 +16,7 @@ func main() {
         "2014-01-17T01:19:15+08:00",
         "2018-02-09T20:46:17.897Z",
         "2018-02-09 20:46:17.897",
+        "2018-02-09T20:46:17Z",
         "2018-02-09 20:46:17",
         "2018-02-09",
     }
diff --git a/geg/util/gtime/gtime2.go b/geg/os/gtime/gtime2.go
similarity index 94%
rename from geg/util/gtime/gtime2.go
rename to geg/os/gtime/gtime2.go
index ce72ecd24..a0ab79fe6 100644
--- a/geg/util/gtime/gtime2.go
+++ b/geg/os/gtime/gtime2.go
@@ -12,6 +12,7 @@ func main() {
         "2014-01-17T01:19:15+08:00",
         "2018-02-09T20:46:17.897Z",
         "2018-02-09 20:46:17.897",
+        "2018-02-09T20:46:17Z",
         "2018-02-09 20:46:17",
         "2018-02-09",
     }