E3 2013 time schedule:
Microsoft: June 10th
Pre-Show - 9AM (Pacific Time)/ 12PM (Eastern Time)/ 5PM (UK Time)
Conference - 9:30AM (Pacific Time)/ 12:30PM (Eastern Time)/ 5:30PM (UK Time)
Post-Show - 11AM (Pacific Time)/ 2PM (Eastern Time)/ 7PM (UK Time)
EA: June 10th
Pre-Show - 12:30PM (Pacific Time)/ 3:30PM (Eastern Time)/ 8:30PM (UK Time)
Conference - 1PM (Pacific Time)/ 4PM (Eastern Time)/ 9PM (UK Time)
Post-Show - 2PM (Pacific Time)/ 5PM (Eastern Time)/ 10PM (UK Time)
Ubisoft: June 10th
Pre-Show - 2:30PM (Pacific Time)/ 5:30PM (Eastern Time)/ 10:30PM
Conference - 3PM (Pacific Time)/ 6PM (Eastern Time)/ 11PM
Post-Show - 4PM (Pacific Time)/ 7PM (Eastern Time)/ 12AM
Sony: June 10th
Pre-Show - 5:30PM (Pacific Time)/ 8:30PM (Eastern Time)/ 1:30AM (UK Time)
Conference - 6PM (Pacific Time)/ 9PM (Eastern Time)/ 2AM (UK Time)
Post-Show - 7PM (Pacific Time)/ 10PM (Eastern Time)/ 3AM (UK Time)
Nintendo: June 11th
Pre-Show - N/A
Conference - 7AM (Pacific Time)/ 10AM (Eastern Time)/ 3PM (UK Time)
Post-Show - 8AM (Pacific Time)/ 11AM (Eastern Time)/ 4PM (UK Time)
Pokemon X/Y Panel: 6PM (Pacific Time)/ 9PM (Eastern Time)/ 2AM (UK Time)
I used IGN for the Pacific Time and pretty much estimated the Eastern Time since we're 3hrs ahead of Pacific. If there's anything wrong with the time, please tell me and I will correct it.
If you live in any of the other time zone in the USA (Mountain/Central) Mountain is 1hr ahead of Pacific and Central is 2hrs ahead of Pacific. If you live in any of the other Euro time zones (WEST, CEST, or EEST). WEST is the same as UK, CEST is a hour ahead, and EEST is 2 hrs ahead.
Hmmm I make a pretty good time keeper.