YSK if you're specifying a time with EST/CST/MST/PST right now, it's almost certainly wrong
One of my pet peeves is when I see people writing times with EST/CST/MST/PST in the summer when they're on daylight time, so the actual time zone is EDT/CDT/MDT/PDT. If you give a time like 3 pm EST right, that's actually an hour earlier than 3 pm on the East Coast.
Why YSK: It might seem like this is a trivial thing, and in most cases it is because people generally know what you mean, but if somebody tries to convert a time exactly as specified, it'll be an hour off of what you intended. This is especially critical if you're dealing with somebody outside the United States.
The good news is there is a simple solution that doesn't require you to remember whether you're in daylight savings time or not. **Just use ET/CT/MT/PT, and it'll always be correct.** Don't complicate things with unnecessary precision.
NOTE: Apologies to any Arizona or Hawaii readers that don't use daylight savings time. #education source