We are afraid to tell you that this Community forum is intended to solve problems related to the Bitnami Stacks, Virtual Machine or Cloud Images.
We highly recommend our users to look for information in more specialized forums when they have problems related to the Application or how to customize its content. In your case, you can visit https://reportserver.net/en/documentation/ and https://forum.reportserver.net/ to obtain more specialized information about your issue.
It seems that from version 3.0.1 (build 5834) they include the next improvement:
Improvement Dynamic list TIMESTAMP WITH LOCAL TIME ZONE support
I hope this information is useful for you. If you have any other question, please do not hesitate to let us know.
Carlos R. Hernández