(quote) Dave-976637 said: Upon further thinking Jerry, I do see a lot of variance in how time and/or time zones have been represented - most of the variations I have seen have been in the media.
The most common example I have seen would be a TV show that starts at "8/7c" where the "c" is used for central. Even looking at an Amtrak time schedule I see they use the notaion of ET for Eastern Time.
From a programming level, I have never seen those abbreviations used, only ever the EST and/or EDT syntax.
I wouldn't expect you to see it within a program because the software will be set to one time zone offset or the other.
The two letter abbreviation, omitting the DST/Standard time indicator is used in situations such as this where where documentation refers to a specific time zone at an indeterminate point in time that may be either daylight savings or standard time. It is not uncommon for people to simply write EST in the same circumstances and assume the reader will make the adjustment, if necessary. In practice, this is probably a reason assumption, albeit a technically incorrect statement since EST = CDT.