How to specify time zone in the URL for REST API

Hi,

I am using JasperServer 5.0.1 and its REST API (rest_v2) to execute a report.
Here is an example of my URL:
http://192.168.1.81:8080/jasperserver/rest_v2/reports/reports/tz_test.pd...

I can successfully change the user locale but I also want to change the time zone since this report is run from various time zones around the world.

Can you tell me how to control the time zone via the REST API?
If that is not possible, what is the suggested method to achieve this goal?

Thanks in advance,
   - Gudmundur Johannesson