diff --git a/cache/README.md b/cache/README.md
index c8cb7454..957790e7 100644
--- a/cache/README.md
+++ b/cache/README.md
@@ -26,7 +26,7 @@ Then init a Cache (example with memory adapter)
 
 Use it like this:	
 	
-	bm.Put("astaxie", 1, time.Second * 10)
+	bm.Put("astaxie", 1, 10 * time.Second)
 	bm.Get("astaxie")
 	bm.IsExist("astaxie")
 	bm.Delete("astaxie")
diff --git a/cache/cache.go b/cache/cache.go
index 78643aea..2008402e 100644
--- a/cache/cache.go
+++ b/cache/cache.go
@@ -23,7 +23,7 @@
 //
 // Use it like this:
 //
-//	bm.Put("astaxie", 1, time.Second * 10)
+//	bm.Put("astaxie", 1, 10 * time.Second)
 //	bm.Get("astaxie")
 //	bm.IsExist("astaxie")
 //	bm.Delete("astaxie")
@@ -40,7 +40,7 @@ import (
 // usage:
 //	cache.Register("file",cache.NewFileCache) // this operation is run in init method of file.go.
 //	c,err := cache.NewCache("file","{....}")
-//	c.Put("key",value, time.Second * 3600)
+//	c.Put("key",value, 3600 * time.Second)
 //	v := c.Get("key")
 //
 //	c.Incr("counter")  // now is 1
diff --git a/cache/cache_test.go b/cache/cache_test.go
index 73e593e9..9ceb606a 100644
--- a/cache/cache_test.go
+++ b/cache/cache_test.go
@@ -25,7 +25,7 @@ func TestCache(t *testing.T) {
 	if err != nil {
 		t.Error("init err")
 	}
-	timeoutDuration := time.Second * 10
+	timeoutDuration := 10 * time.Second
 	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
@@ -102,7 +102,7 @@ func TestFileCache(t *testing.T) {
 	if err != nil {
 		t.Error("init err")
 	}
-	timeoutDuration := time.Second * 10
+	timeoutDuration := 10 * time.Second
 	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
diff --git a/cache/file.go b/cache/file.go
index 80f93bce..3a7aa8b0 100644
--- a/cache/file.go
+++ b/cache/file.go
@@ -147,7 +147,7 @@ func (fc *FileCache) Put(key string, val interface{}, timeout time.Duration) err
 
 	item := FileCacheItem{Data: val}
 	if timeout == FileCacheEmbedExpiry {
-		item.Expired = time.Now().Add(time.Second * (86400 * 365 * 10)) // ten years
+		item.Expired = time.Now().Add((86400 * 365 * 10) * time.Second) // ten years
 	} else {
 		item.Expired = time.Now().Add(timeout)
 	}
diff --git a/cache/memcache/memcache.go b/cache/memcache/memcache.go
index ea77be38..15ea5d3e 100644
--- a/cache/memcache/memcache.go
+++ b/cache/memcache/memcache.go
@@ -100,7 +100,7 @@ func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
 	if !ok {
 		return errors.New("val must string")
 	}
-	item := memcache.Item{Key: key, Value: []byte(v), Expiration: int32(timeout.Seconds())}
+	item := memcache.Item{Key: key, Value: []byte(v), Expiration: int32(timeout/time.Second)}
 	return rc.conn.Set(&item)
 }
 
diff --git a/cache/memcache/memcache_test.go b/cache/memcache/memcache_test.go
index 93484f6b..19629059 100644
--- a/cache/memcache/memcache_test.go
+++ b/cache/memcache/memcache_test.go
@@ -28,7 +28,7 @@ func TestMemcacheCache(t *testing.T) {
 	if err != nil {
 		t.Error("init err")
 	}
-	timeoutDuration := time.Second * 10
+	timeoutDuration := 10 * time.Second
 	if err = bm.Put("astaxie", "1", timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}
diff --git a/cache/memory.go b/cache/memory.go
index 5ba11b3c..d928afdb 100644
--- a/cache/memory.go
+++ b/cache/memory.go
@@ -200,7 +200,7 @@ func (bc *MemoryCache) StartAndGC(config string) error {
 		cf = make(map[string]int)
 		cf["interval"] = DefaultEvery
 	}
-	dur := time.Second * time.Duration(cf["interval"])
+	dur :=  time.Duration(cf["interval"]) * time.Second
 	bc.Every = cf["interval"]
 	bc.dur = dur
 	go bc.vaccuum()
diff --git a/cache/redis/redis.go b/cache/redis/redis.go
index 316cb423..781e3836 100644
--- a/cache/redis/redis.go
+++ b/cache/redis/redis.go
@@ -111,7 +111,7 @@ ERROR:
 // Put put cache to redis.
 func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
 	var err error
-	if _, err = rc.do("SETEX", key, int64(timeout.Seconds()), val); err != nil {
+	if _, err = rc.do("SETEX", key, int64(timeout/time.Second), val); err != nil {
 		return err
 	}
 
diff --git a/cache/redis/redis_test.go b/cache/redis/redis_test.go
index 22059508..e51e409b 100644
--- a/cache/redis/redis_test.go
+++ b/cache/redis/redis_test.go
@@ -28,7 +28,7 @@ func TestRedisCache(t *testing.T) {
 	if err != nil {
 		t.Error("init err")
 	}
-	timeoutDuration := time.Second * 10
+	timeoutDuration := 10 * time.Second
 	if err = bm.Put("astaxie", 1, timeoutDuration); err != nil {
 		t.Error("set Error", err)
 	}