Because I'm currently playing with a lot of AJAX frameworks I'm searching for the correct use of dates and times in web applications. Ajax.NET Professional  is using time zone indentifier to know from which time zone the request is comming from. See following server-side C# code:
public static DateTime GetCurrentTime()
How does this effect web farms where one of the web server is running in a different time zone, is this possible? And, when I look at DNS configuration of some A records I see that there are multiple IP addresses defined. When the web servers for each IP address is located in a different time zone you will have the same problem when dates do not include time zones.