>To all who addressed this thread,
>
>Yes there is this custom in England too; in pretty much most of Europe
>actually, Australia, New Zealand, North America, and Japan.
>
>In England it is called "Daylight Saving Time", ie. the "DST" that you
>see as an option when you install Novell Netware or Windows NT server.
>
>Thanks for the clarifications. Unlike Mike I knew about CST, EST, and all the
>others, but did not know about the CDT, EDT, etc....

The reason we need two terms in this country is that not everyone does the time switch. Arizona, Hawaii, and some rebellious parts of Indiana do not use daylight time, so even in one state, you can have both EST and EDT from one town to the next...