diff --git a/api/handler/copy.go b/api/handler/copy.go
index 897f585..0d08a07 100644
--- a/api/handler/copy.go
+++ b/api/handler/copy.go
@@ -111,7 +111,7 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 	if info, err = h.obj.CopyObject(r.Context(), params); err != nil {
 		h.logAndSendError(w, "couldn't copy object", reqInfo, err, additional...)
 		return
-	} else if err = api.EncodeToResponse(w, &CopyObjectResponse{LastModified: info.Created.Format(time.RFC3339), ETag: info.HashSum}); err != nil {
+	} else if err = api.EncodeToResponse(w, &CopyObjectResponse{LastModified: info.Created.UTC().Format(time.RFC3339), ETag: info.HashSum}); err != nil {
 		h.logAndSendError(w, "something went wrong", reqInfo, err, additional...)
 		return
 	}
diff --git a/api/handler/list.go b/api/handler/list.go
index 4a7ade7..1d02ea0 100644
--- a/api/handler/list.go
+++ b/api/handler/list.go
@@ -38,7 +38,7 @@ func (h *handler) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
 	for _, item := range list {
 		res.Buckets.Buckets = append(res.Buckets.Buckets, Bucket{
 			Name:         item.Name,
-			CreationDate: item.Created.Format(time.RFC3339),
+			CreationDate: item.Created.UTC().Format(time.RFC3339),
 		})
 	}
 
diff --git a/api/handler/multipart_upload.go b/api/handler/multipart_upload.go
index cb466b1..f96623b 100644
--- a/api/handler/multipart_upload.go
+++ b/api/handler/multipart_upload.go
@@ -342,7 +342,7 @@ func (h *handler) UploadPartCopy(w http.ResponseWriter, r *http.Request) {
 
 	response := UploadPartCopyResponse{
 		ETag:         info.HashSum,
-		LastModified: info.Created.Format(time.RFC3339),
+		LastModified: info.Created.UTC().Format(time.RFC3339),
 	}
 
 	if err = api.EncodeToResponse(w, response); err != nil {
@@ -636,7 +636,7 @@ func encodeListMultipartUploadsToResponse(info *layer.ListMultipartUploadsInfo,
 	uploads := make([]MultipartUpload, 0, len(info.Uploads))
 	for _, u := range info.Uploads {
 		m := MultipartUpload{
-			Initiated: u.Created.Format(time.RFC3339),
+			Initiated: u.Created.UTC().Format(time.RFC3339),
 			Initiator: Initiator{
 				ID:          u.Owner.String(),
 				DisplayName: u.Owner.String(),
diff --git a/api/handler/object_list.go b/api/handler/object_list.go
index d061b82..28ebf9b 100644
--- a/api/handler/object_list.go
+++ b/api/handler/object_list.go
@@ -194,7 +194,7 @@ func fillContents(src []*data.ObjectInfo, encode string, fetchOwner bool) []Obje
 		res := Object{
 			Key:          s3PathEncode(obj.Name, encode),
 			Size:         obj.Size,
-			LastModified: obj.Created.Format(time.RFC3339),
+			LastModified: obj.Created.UTC().Format(time.RFC3339),
 			ETag:         obj.HashSum,
 		}
 
@@ -281,7 +281,7 @@ func encodeListObjectVersionsToResponse(info *layer.ListObjectVersionsInfo, buck
 		res.Version = append(res.Version, ObjectVersionResponse{
 			IsLatest:     ver.IsLatest,
 			Key:          ver.Object.Name,
-			LastModified: ver.Object.Created.Format(time.RFC3339),
+			LastModified: ver.Object.Created.UTC().Format(time.RFC3339),
 			Owner: Owner{
 				ID:          ver.Object.Owner.String(),
 				DisplayName: ver.Object.Owner.String(),
@@ -296,7 +296,7 @@ func encodeListObjectVersionsToResponse(info *layer.ListObjectVersionsInfo, buck
 		res.DeleteMarker = append(res.DeleteMarker, DeleteMarkerEntry{
 			IsLatest:     del.IsLatest,
 			Key:          del.Object.Name,
-			LastModified: del.Object.Created.Format(time.RFC3339),
+			LastModified: del.Object.Created.UTC().Format(time.RFC3339),
 			Owner: Owner{
 				ID:          del.Object.Owner.String(),
 				DisplayName: del.Object.Owner.String(),
diff --git a/api/layer/multipart_upload.go b/api/layer/multipart_upload.go
index 18b1b1e..cb0d767 100644
--- a/api/layer/multipart_upload.go
+++ b/api/layer/multipart_upload.go
@@ -404,7 +404,7 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 		}
 		parts = append(parts, &Part{
 			ETag:         objInfo.HashSum,
-			LastModified: objInfo.Created.Format(time.RFC3339),
+			LastModified: objInfo.Created.UTC().Format(time.RFC3339),
 			PartNumber:   num,
 			Size:         objInfo.Size,
 		})