Date shift Issue (time zone)

Hi,

I have 2 reports with some bar, pie charts, those work fine when I work in my laptop.. But when I deploy the same into the production server, the dates are shifted 2 days before..

i.e., If I give filter as June, instead of getting the data dated from 2012-6-1 to 2012-6-30, I get the data dated from 2012-5-29 to 2012-6-28...

So, the dates are shifted to 2 days before, but I am able to get the proper data for the month.. I guess it is some timezone issue, but how do I resolve this in ireport..?

I found options in ireport Tools > Options >    Compilation and execution -- Report Locale, Report Time Zone... what values should I provide here??

Or Is there any other way to resolve this date shift issue???