public static String formatSimple(TemporalAccessor temporalAccessor) {
        Objects.requireNonNull(temporalAccessor, "temporalAccessor");
        return SIMPLE_DATE_FORMATTER.format(temporalAccessor);
    }
Returns the current time in milliseconds.
precision : milliseconds
@return the current time in milliseconds
commons-timeseries/src/main/java/com/navercorp/pinpoint/common/timeseries/time/DateTimeUtils.java