If you need to indicate that a time is in a certain time zone, the simplest way to do it is to put the time zone abbreviation after the time: for Eastern Standard Time, write “4:30 p.m. EST.”

Should I use ET or EST or EDT?

ET is used to denote the local time in areas that observe both Eastern Standard Time (EST) and Eastern Daylight Time (EDT). It is essential to understand that EST and EDT refer to different time zones because Eastern Standard Time is five hours behind the Coordinated Universal Time (UTC).

Do we say ET or EST?

If you want to refer to the entire Eastern Time zone, without regard to whether daylight saving time is in effect or not, the correct abbreviation would be ET . In other words: EST = Eastern Standard Time = UTC-05:00.

The term Eastern Time (ET) is often used to denote the local time in areas observing either Eastern Standard Time (EST) or Eastern Daylight Time (EDT). In other words, in locations observing Daylight Saving Time (DST) during part of the year, Eastern Time is not static but switches between EST and EDT.