Use lowercase letters to designate time zones unless the name of the time zone includes a proper noun.
Do not specify daylight time or standard time. For example, say eastern time and not eastern standard time or eastern daylight time.
Examples
Central time
Eastern time
Greenwich mean time
Mountain time
Pacific time
Exception for internal communications
Avaya is based in New Jersey. Therefore, use the eastern time zone to identify the time for a company event, unless the event takes place in another country. If the event takes place in another country, use the local time. Include the time zone in parentheses after the clock time, and use the format that the following example shows.
Example
The all-employee audiocast begins at 10 a.m. (U.S. Eastern time).
