Report Builder 2.0 : How to get the correct timezone info.

Question

I am developing report using SQL Report Builder 2.0, In this I am passing the timezone offset value as a parameter (-04:00). Using "TimeZoneInfo" I am getting all the timezones available from the system. But I am checking the timezone with the offset value, so from the list available I can only get the first timezone object.

Is there any other ways to get a specific TimezoneInfo from the system.

Thanks, Veera