java/org/apache/juli/DateFormatCache.java [132:181]:
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            long seconds = time / 1000;

            /* First step: if we have seen this timestamp
               during the previous call, return the previous value. */
            if (seconds == previousSeconds) {
                return previousFormat;
            }

            /* Second step: Try to locate in cache */
            previousSeconds = seconds;
            int index = (offset + (int)(seconds - first)) % cacheSize;
            if (index < 0) {
                index += cacheSize;
            }
            if (seconds >= first && seconds <= last) {
                if (cache[index] != null) {
                    /* Found, so remember for next call and return.*/
                    previousFormat = cache[index];
                    return previousFormat;
                }

            /* Third step: not found in cache, adjust cache and add item */
            } else if (seconds >= last + cacheSize || seconds <= first - cacheSize) {
                first = seconds;
                last = first + cacheSize - 1;
                index = 0;
                offset = 0;
                for (int i = 1; i < cacheSize; i++) {
                    cache[i] = null;
                }
            } else if (seconds > last) {
                for (int i = 1; i < seconds - last; i++) {
                    cache[(index + cacheSize - i) % cacheSize] = null;
                }
                first = seconds - (cacheSize - 1);
                last = seconds;
                offset = (index + 1) % cacheSize;
            } else if (seconds < first) {
                for (int i = 1; i < first - seconds; i++) {
                    cache[(index + i) % cacheSize] = null;
                }
                first = seconds;
                last = seconds + (cacheSize - 1);
                offset = index;
            }

            /* Last step: format new timestamp either using
             * parent cache or locally. */
            if (parent != null) {
                synchronized(parent) {
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java/org/apache/catalina/valves/AbstractAccessLogValve.java [283:332]:
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                long seconds = time / 1000;

                /* First step: if we have seen this timestamp
                   during the previous call, and we need CLF, return the previous value. */
                if (seconds == previousSeconds) {
                    return previousFormat;
                }

                /* Second step: Try to locate in cache */
                previousSeconds = seconds;
                int index = (offset + (int)(seconds - first)) % cacheSize;
                if (index < 0) {
                    index += cacheSize;
                }
                if (seconds >= first && seconds <= last) {
                    if (cache[index] != null) {
                        /* Found, so remember for next call and return.*/
                        previousFormat = cache[index];
                        return previousFormat;
                    }

                /* Third step: not found in cache, adjust cache and add item */
                } else if (seconds >= last + cacheSize || seconds <= first - cacheSize) {
                    first = seconds;
                    last = first + cacheSize - 1;
                    index = 0;
                    offset = 0;
                    for (int i = 1; i < cacheSize; i++) {
                        cache[i] = null;
                    }
                } else if (seconds > last) {
                    for (int i = 1; i < seconds - last; i++) {
                        cache[(index + cacheSize - i) % cacheSize] = null;
                    }
                    first = seconds - (cacheSize - 1);
                    last = seconds;
                    offset = (index + 1) % cacheSize;
                } else if (seconds < first) {
                    for (int i = 1; i < first - seconds; i++) {
                        cache[(index + i) % cacheSize] = null;
                    }
                    first = seconds;
                    last = seconds + (cacheSize - 1);
                    offset = index;
                }

                /* Last step: format new timestamp either using
                 * parent cache or locally. */
                if (parent != null) {
                    synchronized(parent) {
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