Quick poll for non-US techwrlers: time notation

[Dick Margulis <margulis -at- fiam -dot- net>]

On our Web site, we often post announcements about online events that 
are accessible to people worldwide. The notation I've been using for the 
time of day follows this model:

11:30 AM to 1:00 PM EST (4:30 to 6:00 PM GMT)

The audience for these announcements consists mostly of senior 
executives of manufacturing companies (as opposed to airline pilots or 
network engineers, for example). The intent of the parenthetical time 
expression is to serve as a guide for people who may not know what "EST" 
means.

Questions:

1. Is this clear?

2. Would it be clearer to refer to UTC instead of GMT (assume that space 
is tight and I can't spell out the meaning of the abbreviation)?

3. Would 24-hour notation be more familiar (e.g., "1630 to 1800")?

Thanks. Please reply privately. I'll summarize for list.

Dick


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