Hi Harshada, adding the ability to adjust the default timezone is on our roadmap:
https://github.com/growthbook/growthbook/issues/1287
Feel free to chime in on the GitHub issue in support of this feature.
I'm not sure what your database schema is like, but if the table you're using is GrowthBook-specific, are you able to adjust the timezone to UTC on the database to match the default GrowthBook time zone?