fix unit test failed

Signed-off-by: xuwenping <[email protected]>

Author: xuwenping123

logback-access/src/main/java/ch/qos/logback/access/pattern/DateConverter.java

@@ -53,7 +53,6 @@ public void start() {
 
         try {
             cachingDateFormatter = new CachingDateFormatter(datePattern, zoneId, locale);
-            // maximumCacheValidity = CachedDateFormat.getMaximumCacheValidity(pattern);
         } catch (IllegalArgumentException e) {
             addWarn("Could not instantiate SimpleDateFormat with pattern " + datePattern, e);
             addWarn("Defaulting to  " + CoreConstants.CLF_DATE_PATTERN);