diff --git a/def.go b/def.go
index 0634494..ed1a852 100644
--- a/def.go
+++ b/def.go
@@ -126,9 +126,9 @@ func fromChatWarsDate(d string) (t time.Time, err error) {
 
 		t, _ := time.Parse(time.RFC3339, "2018-01-31T00:00:00+00:00")
 		t = t.AddDate(0, 0, (days / 3))
-		t = t.Add(time.Hour * ((days % 3) * 8))
-		t = t.Add(time.Minute * (hour * 20))
-		t = t.Add(time.Second * (minute * 20))
+		t = t.Add(time.Hour * time.Duration(days%3) * 8)
+		t = t.Add(time.Minute * time.Duration(hour) * 20)
+		t = t.Add(time.Second * time.Duration(minute) * 20)
 		return t, nil
 	} else {
 		return time.Now(), errors.New("Wrong format")