I usually just write ET to mean both. (And CT, MT, PT, etc.)
Yeah I'm being picky. It's a pet peeve. Sorry.
Edit: After a downvote -- actually, I'm not sorry anymore for pointing this out. Roughly half the year there is no such thing as EST. Think that's picky? Bite me. (Note that I didn't grammar police their use of "vary" instead of "very".)
http://allthingsd.com/20130514/netflix-still-eats-a-third-of...
Similar to where they were at the year prior:
http://allthingsd.com/20121107/netflix-has-plenty-of-competi...