public static String formatDateWithMillis(Calendar date) {
        return DateFormatUtils.formatUTC(date.getTimeInMillis(), "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); //$NON-NLS-1$
    }
@param date the date to format
manager/api/core/src/main/java/io/apiman/manager/api/core/metrics/MetricsAccessorHelper.java