Our company runs a SaaS application where users log in from across the world (although mostly in the US).  We store all our time relevant information as UTC, but we need to display times using local time.  The application is web based, and we would like to auto-detect the user's Time Zone by using javascript to determine their UTC offsets during various times of the year.  The user's offset info would be passed to our server in their first request and the server will look up all the Time Zones that it knows about and see which valid time zones match.I'd like to use the built in TimeZoneInfo object, but I understand thatTimeZoneInfo.GetSystemTimeZones();relies on the server's registry settings.  We currently have 18 load balanced web servers that host our WCF service layer, and I believe our TechOps team is vigilant in making sure that all servers are patched with the same service pack at all times.I also need to pay special attention to the various US Time Zones, specifically Pacific, Mountain, Central and Eastern.  Can I assume that the string based Id field will not change anytime soon?  For example, if I callTimeZoneInfo.FindSystemTimeZoneById(Pacific Standard Time)I want the appropriate TimeZoneInfo object to be returned.So a few questions:What is the best way to deal with time zones, especially when it comes to the changing rules (US time zone rules changed in 2006) and determining offsets.  Should I be trying something else?  Keep in mind that the product team doesn't want the user to have to select their time zone and they are fine with time zones being inaccurately reported under certain  conditions (e.g. if the user is in Mexico, it is ok to be reported as Pacific Standard Time instead of the more accurate Pacific Standard Time (Mexico).If I assume that all of our load balanced web servers are always running the same OS version and patch level, can I assume that I will get consistent results?Are there any other things I need to consider?
How should I deal with Time Zones in a .NET WCF application?
c#;.net;wcf;time;windows registry