if err != nil || (err == nil && ondiskTimestamp.Before(srcTimestamp)) {
					srcInfo.UserDefined[ReservedMetadataPrefixLower+TaggingTimestamp] = srcTimestamp.UTC().Format(time.RFC3339Nano)
					srcInfo.UserDefined[xhttp.AmzObjectTagging] = objTags
				}
			}
		} else {
			srcInfo.UserDefined[xhttp.AmzObjectTagging] = objTags
			srcInfo.UserDefined[ReservedMetadataPrefixLower+TaggingTimestamp] = UTCNow().Format(time.RFC3339Nano)
		}

			ReplicationStatus:         replication.StatusType(objInfo.ReplicationStatus),
		}
		oi.UserDefined = make(map[string]string, len(objInfo.Metadata))
		for k, v := range objInfo.Metadata {
			oi.UserDefined[k] = v[0]
		}
		ce, ok := oi.UserDefined[xhttp.ContentEncoding]
		if !ok {
			ce, ok = oi.UserDefined[strings.ToLower(xhttp.ContentEncoding)]
		}
		if ok {
			oi.ContentEncoding = ce
		}

		// uploading the object.
		_, err := obj.PutObject(context.Background(), input.bucketName, input.objectName, mustGetPutObjReader(t, bytes.NewReader(input.textData), input.contentLength, input.metaData[""], ""), ObjectOptions{UserDefined: input.metaData})
		// if object upload fails stop the test.
		if err != nil {
			t.Fatalf("Put Object case %d:  Error uploading object: <ERROR> %v", i+1, err)
		}
	}