I need some UTC stamp explanation. I sent an email on March 10, 2011 (EST) that should have had a -0500 timestamp because it was sent in eastern standard time. However, when I received a reply to this email after the time change to eastern daylight time, the time stamp came through in a reply as -0400. Can you help me to understand how the timezone offset stamp is generated for use in the body of an email? Is it based on the current timezone rather than the timezone that was in place at the time?