diff --git a/write.go b/write.go
index c9cfba2..92d1753 100644
--- a/write.go
+++ b/write.go
@@ -1044,7 +1044,7 @@ func (mp4 MP4) writeTags(boxes MP4Boxes, tags *MP4Tags, tempPath string) error {
 		if err != nil {
 			return err
 		}
-	} else if tags.Date == "" {
+	} else if tags.Date != "" {
 		err = writeRegular(f, "day", tags.Date, true)
 		if err != nil {
 			return err
@@ -1134,4 +1134,4 @@ func (mp4 *MP4) actualWrite(tags *MP4Tags, _delStrings []string) error {
 	mp4.f = m.f
 	mp4.size = m.size
 	return nil
-}
\ No newline at end of file
+}