[tz] 'date -u' should say "UTC", not "GMT"

[Steve Allen]

On Tue 2014-06-24T21:10:25 +0000, Paul_Koning at dell.com hath writ:
> UTC, yes.  UT?  I know of UT1 and UT2, but neither are the same as
> UTC and neither is applicable here.

The name that was in contemporary use during the 1960s is another
tl;dr story as seen in
http://www.ucolick.org/~sla/leapsecs/timescales.html#UTC

"UTC" was not used in print until 1965, was not found in broadcast
time signals nor any recommendation until 1974, and all around that
range of dates different agencies employed different terminologies.

--
Steve Allen                 <sla at ucolick.org>                WGS-84 (GPS)
UCO/Lick Observatory--ISB   Natural Sciences II, Room 165    Lat  +36.99855
1156 High Street            Voice: +1 831 459 3046           Lng -122.06015
Santa Cruz, CA 95064        http://www.ucolick.org/~sla/     Hgt +250 m