// Pad necessary zeroes to full-fill the iso8601TimeFormat
		return value + strings.Repeat("0", (len(iso8601TimeFormat)-1)-len(value)) + "Z"
	}
	return value
}

// ISO8601Parse parses ISO8601 date string
func ISO8601Parse(iso8601 string) (t time.Time, err error) {
	for _, layout := range []string{
		iso8601TimeFormat,
		iso8601TimeFormatLong,
		time.RFC3339,
	} {
		t, err = time.Parse(layout, iso8601)

		return err
	}
	// While AWS documentation mentions that the date specified
	// must be present in ISO 8601 format, in reality they allow
	// users to provide RFC 3339 compliant dates.
	retDate, err := amztime.ISO8601Parse(dateStr)
	if err != nil {
		return ErrInvalidRetentionDate
	}

	*rDate = RetentionDate{retDate}
	return nil
}

// MarshalXML encodes expiration date if it is non-zero and encodes

		rmode := minio.RetentionMode(mode)
		putOpts.Mode = rmode
	}
	if retainDateStr, ok := lkMap.Lookup(xhttp.AmzObjectLockRetainUntilDate); ok {
		rdate, err := amztime.ISO8601Parse(retainDateStr)
		if err != nil {
			return putOpts, err
		}
		putOpts.RetainUntilDate = rdate
		// set retention timestamp in opts
		retTimestamp := objInfo.ModTime