UK vs East Coast US time:
EDT is Eastern Daylight Time (as opposed to EST--Eastern Standard Time--please correct me if I have my terms messed up)...thus referring to the "spring forward" one hour (which happens to occur one week after the UK "springs forward". I think US and UK "fall back" the hour the same weekend.)...with the exception of that one week, the time difference is 5 hours(as I mentioned above).
PS I hope I'll have a chance to tune in!