If you think you're smart by putting "EST" or "CST" after the time a meeting is supposed to start, and you do it wrong, you're someone I want to punch.
"EST" means "Eastern Standard Time". We are currently in "Eastern Daylight Saving Time", or "EDT". If you make a meeting in August for 10:00 EST, you're doing it wrong. If you really want to set the meeting for 10:00EST, just set it for 11:00EDT.