title: "US Eastern Standard Time" vs "Eastern Standard Time" in .NET
body: <p>In listing all the <code>Id</code> properties of the <code>TimeZoneInfo</code>s returned by <code>TimeZoneInfo.GetSystemTimeZones</code>, two versions of EST appear: US Eastern Standard Time and Eastern Standard Time.  What's the difference?</p>
  
  <p>I also see both US Mountain Standard Time and Mountain Standard Time, but I'm pretty sure that's because the US version is for Arizona, which doesn't observe DST.  I'd assume the regular Mountain Standard Time applies for the rest of the US states in the Mountain time zone.  Am I correct?</p>
  
  <p>Helpful link on US time zones: <a href="http://www.timetemperature.com/tzus/time_zone.shtml">http://www.timetemperature.com/tzus/time_zone.shtml</a></p>