diff --git a/example/example.go b/example/example.go
index 16d4eb9..6e8adfe 100644
--- a/example/example.go
+++ b/example/example.go
@@ -2,13 +2,18 @@ package main
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/godruoyi/go-snowflake"
 )
 
 func main() {
+	// set starttime and machineID for the first time if you wan't to use the default value
+	snowflake.SetStartTime(time.Date(2021, 9, 1, 0, 0, 0, 0, time.UTC))
+	snowflake.SetMachineID(snowflake.PrivateIPToMachineID()) // testing, not to be used in production
+
 	id := snowflake.ID()
-	fmt.Println(id)
+	fmt.Println(id) // 1537200202186752
 
 	sid := snowflake.ParseID(id)
 	// SID {
diff --git a/snowflake.go b/snowflake.go
index cab2d38..9b5eb19 100644
--- a/snowflake.go
+++ b/snowflake.go
@@ -84,7 +84,7 @@ func SetStartTime(s time.Time) {
 		panic("The start time cannot be a zero value")
 	}
 
-	if s.After(time.Now()) {
+	if s.After(time.Now().UTC()) {
 		panic("The s cannot be greater than the current millisecond")
 	}