diff --git a/main.go b/main.go
index 353815a..6cef24f 100644
--- a/main.go
+++ b/main.go
@@ -24,7 +24,7 @@ type CountLiveAnchors struct {
 
 func getArgsStartTime() time.Time {
 	date := flag.Arg(0)
-	if date != "" {
+	if date == "" {
 		panic("please input date eg. '2020-11-30 16:29:17'")
 	}
 	start, err := time.ParseInLocation("2006-01-02 15:04:03", date, time.Local)