Finding the offset of a specific time zone

Hello folks,
 
Here is a problem I am facing right now. I work on an application that will
be hosted on some servers located in Florida. The application collects data
from some field devices located in California. The field devices contain a
time stamp that represents the date and time when the device was last time
updated. This, obviously, comes as Pacific local time. Every time a record
related to the actual device is updated in the database, the application
must update a date&time field. Since the application runs in Florida, this
will be Eastern local time.
 
I need to somehow be able to save these times in relation to UTC. The
database is Oracle and it has two components, a date and time and an offset
to the UTC. My question is whether I can somehow figure out programmatically
what is the offset to UTC for various time zones.
 
For the server where the application runs I can do something like this:
 
DateTime dtNow = DateTime.Now;
DateTime dtUtcNow = dtNow.ToUniversalTime();
double dOffset = (dtUtcNow - dtNow).TotalHours;
 
The question is how can I find out the offset of the time stamp that comes
from the field device. Is there any method in .Net that will give me that?
 
.NET 3.5 has TimeZoneInfo, a class that seems to solve this very issue, but
we are using a .NET 3.0 environment and TimeZoneInfo is not available. Does
anyone has any idea how this can be achieved in .NET 3.0?
Any suggestion will be highly appreciated.
 
Regards,
Eddie

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