[time-nuts] What is NIST "official time" ?

[Mike S]

At 10:16 AM 8/4/2011, Christopher Quarksnow wrote...
>Wondering whether anyone can clarify what discipline the Boulder, CO 
>NIST
>facility is broadcasting (or showing on time.gov) and qualified as 
>"The
>official U.S. time".
>It appears to be about 20 seconds slower than UTC and I could not find 
>the
>relation to other known time scales such as TAI, UTC, ET, UT1, GPS or
>possibly grid or broadcast-interconnected reference.

NIST broadcasts UTC, they even say so in the broadcast - "At the 
tone...Coordinated Universal Time".

http://www.nist.gov/pml/div688/grp40/wwv_format.cfm