days := int(math.Ceil(math.Abs(objRetention.RetainUntilDate.Sub(t).Hours()) / 24))

	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
	if ret.Mode.Valid() {
		// Retention has expired you may change whatever you like.
		if ret.RetainUntilDate.Before(t) {
			apiErr := isPutRetentionAllowed(oi.Bucket, oi.Name,
				days, objRetention.RetainUntilDate.Time,
				objRetention.Mode, byPassSet, r, cred,
				owner)

			expectedErr: ErrUnknownWORMModeDirective,
			expectErr:   true,
		},
		{
			value:       `<?xml version="1.0" encoding="UTF-8"?><Retention xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Mode>COMPLIANCE</Mode><RetainUntilDate>2017-01-02T15:04:05Z</RetainUntilDate></Retention>`,
			expectedErr: ErrPastObjectLockRetainDate,

	}
	if retainDateStr, ok := lkMap.Lookup(xhttp.AmzObjectLockRetainUntilDate); ok {
		rdate, err := amztime.ISO8601Parse(retainDateStr)
		if err != nil {
			return putOpts, false, err
		}
		putOpts.RetainUntilDate = rdate
		// set retention timestamp in opts
		retTimestamp := objInfo.ModTime
		if retainTmstampStr, ok := objInfo.UserDefined[ReservedMetadataPrefixLower+ObjectLockRetentionTimestamp]; ok {

				oi.UserDefined[strings.ToLower(xhttp.AmzObjectLockMode)] = string(objRetention.Mode)
				oi.UserDefined[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = amztime.ISO8601Format(objRetention.RetainUntilDate.UTC())
			} else {
				oi.UserDefined[strings.ToLower(xhttp.AmzObjectLockMode)] = ""
				oi.UserDefined[strings.ToLower(xhttp.AmzObjectLockRetainUntilDate)] = ""
			}