diff --git a/simplelog.go b/simplelog.go
index f0cf043..df42802 100644
--- a/simplelog.go
+++ b/simplelog.go
@@ -46,7 +46,7 @@ const (
 
 var LevelName [6]string = [6]string{"Trace", "Debug", "Info ", "Warn ", "Error", "Fatal"}
 
-const TimeFormat = "2006/01/02 15:04:05"
+const TimeFormat = "2006/01/02 15:04:05.999"
 
 const maxBufPoolSize = 16