[tz] Multiple UTC zones

[Paul Eggert]

On 06/24/2014 01:25 PM, Matt Johnson wrote:
> Does anyone know if there is a concrete reason for why Etc/GMT, 
> Etc/UTC and Etc/UCT are three separate zones?

They use different time zone abbreviations, and so cannot be links.  For 
example:

$ TZ=Etc/GMT date; TZ=Etc/UCT date; TZ=Etc/UTC date; date -u
Tue Jun 24 20:31:12 GMT 2014
Tue Jun 24 20:31:12 UCT 2014
Tue Jun 24 20:31:12 UTC 2014
Tue Jun 24 20:31:12 GMT 2014

The last line of output depends on your 'date' implementation; GNU 
'date', for example, says "UTC", but tz 'date' says "GMT".