private int getStartIdx() {
      int startIdx = 0;
      if (startTime != -1) {
        long startTimeStamp = startTime - resource.getTimeBase();
        long[] timestamps = resource.getAllRawTimeStamps();
        for (int i = resource.getFirstTimeStampIdx(); i < resource.getFirstTimeStampIdx()
            + series.getSize(); i++) {
          if (timestamps[i] >= startTimeStamp) {
            break;
          }
          startIdx++;
        }
      }
      return startIdx;
    }
Provides the value series related to a single statistics.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java