}
			// validating presign date field.
			if testCase.expectedPreSignValues.Date.UTC().Format(iso8601Format) != parsedPreSign.Date.UTC().Format(iso8601Format) {
				t.Errorf("Test %d: Expected date to be %v, but got %v", i+1, testCase.expectedPreSignValues.Date.UTC().Format(iso8601Format), parsedPreSign.Date.UTC().Format(iso8601Format))
			}
		}
	}

		ETag:         "\"" + etag + "\"",
		LastModified: amztime.ISO8601Format(lastModified.UTC()),
	}
}

// generates CopyObjectPartResponse from etag and lastModified time.
func generateCopyObjectPartResponse(etag string, lastModified time.Time) CopyObjectPartResponse {
	return CopyObjectPartResponse{
		ETag:         "\"" + etag + "\"",
		LastModified: amztime.ISO8601Format(lastModified.UTC()),
	}
}

			expectedOutput: "2009-11-13T04:51:01.941Z",
		},
	}

	for _, testCase := range testCases {
		t.Run(testCase.expectedOutput, func(t *testing.T) {
			gotOutput := ISO8601Format(testCase.date)
			t.Log("Go", testCase.date.Format(iso8601TimeFormat))
			if gotOutput != testCase.expectedOutput {
				t.Errorf("Expected %s, got %s", testCase.expectedOutput, gotOutput)
			}
		})
	}

	if aec != ErrNone {
		return psv, aec
	}

	var e error
	// Save date in native time.Time.
	preSignV4Values.Date, e = time.Parse(iso8601Format, query.Get(xhttp.AmzDate))
	if e != nil {
		return psv, ErrMalformedPresignedDate
	}

	// Save expires in native time.Duration.
	preSignV4Values.Expires, e = time.ParseDuration(query.Get(xhttp.AmzExpires) + "s")

	hashedChunk := hex.EncodeToString(cr.chunkSHA256Writer.Sum(nil))

	// Calculate string to sign.
	alg := signV4ChunkedAlgorithm + "\n"
	stringToSign := alg +
		cr.seedDate.Format(iso8601Format) + "\n" +
		getScope(cr.seedDate, cr.region) + "\n" +
		cr.seedSignature + "\n" +
		emptySHA256 + "\n" +
		hashedChunk

	// Get hmac signing key.

	objRetentionMeta[strings.ToLower(xhttp.AmzObjectLockMode)] = string(objectlock.RetCompliance)
	// Set retain until date 12 hours into the future
	objRetentionMeta[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = amztime.ISO8601Format(now.Add(12 * time.Hour))
	/*
		objInfos:
		version stack for obj-1
		v5 uuid-5 modTime
		v4 uuid-4 modTime -1m
		v3 uuid-3 modTime -2m
		v2 uuid-2 modTime -3m
		v1 uuid-1 modTime -4m
	*/

	hashedPayload := req.Header.Get("x-amz-content-sha256")
	if hashedPayload == "" {
		return "", fmt.Errorf("Invalid hashed payload")
	}

	// Set x-amz-date.
	req.Header.Set("x-amz-date", currTime.Format(iso8601Format))

	// Get header map.
	headerMap := make(map[string][]string)
	for k, vv := range req.Header {
		// If request header key is not in ignored headers, then add it.

// empty string otherwise
func (rDate RetentionDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
	if rDate.IsZero() {
		return nil
	}
	return e.EncodeElement(amztime.ISO8601Format(rDate.Time), startElement)
}

// ObjectRetention specified in
// https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectRetention.html
type ObjectRetention struct {

					srcInfo.UserDefined[strings.ToLower(xhttp.AmzObjectLockMode)] = string(retentionMode)
					srcInfo.UserDefined[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = amztime.ISO8601Format(retentionDate.UTC())
					srcInfo.UserDefined[ReservedMetadataPrefixLower+ObjectLockRetentionTimestamp] = srcTimestamp.UTC().Format(time.RFC3339Nano)
				}
			}
		} else {

	if s3Err == ErrNone && retentionMode.Valid() {
		metadata[strings.ToLower(xhttp.AmzObjectLockMode)] = string(retentionMode)
		metadata[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = amztime.ISO8601Format(retentionDate.UTC())
	}
	if s3Err == ErrNone && legalHold.Status.Valid() {
		metadata[strings.ToLower(xhttp.AmzObjectLockLegalHold)] = string(legalHold.Status)
	}
	if s3Err != ErrNone {