Hi Krishna,
I had raised an OSS for this information and SAP's response was:
Question: Date Timestamp mismatch between S&OP WebUI and HANA DB and OS level
"The status logs in Excel, the index server logs, and the web UI data integration time stamp are all in UTC. That time cannot be changed. Everything else should be the system time"
Hope this helps.
Regards,
Aditya G