Update README.md

README.md

@@ -23,6 +23,19 @@ Extracted the log messages from the original log data (Json format). Parsed the
 
 Note: 20240207 data does not contain EKS log data; it solely comprises CloudTrail log data in CSV format. Consequently, this dataset does not require preprocessing with a log parser.
 
+## Timezone Note (Important)
+
+PPTX scenario slides use Japan Standard Time (JST) for measurement periods and failure timestamps, because the real testbed is located in Japan and failures were recorded locally.
+
+All metric and log data are timestamped in UTC.
+
+This means there is a 9-hour offset between the PPTX timestamps and the data files.
+For example:
+11:30 JST → 02:30 UTC
+
+When aligning ground truth with the metric/log data, please convert all PPTX times from JST to UTC.
+
+
 ## Citation:
 
 Lecheng Zheng, Zhengzhang Chen, Dongjie Wang, Chengyuan Deng, Reon Matsuoka, and Haifeng Chen: LEMMA-RCA: A Large Multi-modal Multi-domain Dataset for Root Cause Analysis. CoRR abs/2406.05375 (2024)