[tz] Why is `Etc/UCT` not an alias of `Etc/UTC`?

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sun Mar 10 04:21:54 UTC 2019

On 2019-03-05 17:13, Isiah Meadows wrote:
> On Tue, Mar 5, 2019 at 6:21 PM Paul Eggert wrote:
>> On 3/5/19 3:07 PM, Guy Harris wrote:
>>> Is there any information about whether "UTC" or "UCT" is the more
>>> commonly used abbreviation in documents in English?
>> "UTC" is far more common. For example, for me Google reports about 4,220 
>> hits for the query "Universal Coordinated Time (UCT)" and about 1,080,000
>> hits for "Coordinated Universal Time (UTC)". For Google Scholar the numbers
>> are 210 and 11,800 respectively. For Google Books they are 493 and 12,500
>> respectively. In all cases the double-quote characters were in the query.
>> My vague impression is that "UCT" was formerly more popular than it is
>> now, but it's never been as popular as "UTC".
> I came up with a somewhat more permissive set of queries that seem to show a
> similar disparity in usage:
> - '"Universal Coordinated Time" "UCT"': about 9,620 results in search,
> 344 in Scholar
> - '"Coordinated Universal Time" "UTC"': about 2,580,000 results in
> search, 17,900 in Scholar
> - '"Universal Coordinated Time" "UCT" -"UTC"': about 4,730 results in
> search, 256 in Scholar
> - '"Coordinated Universal Time" "UTC" -"UCT"': about 2,250,000 results
> in search, 17,600 in Scholar
> The first two show just raw mentions of each, while the second two
> captures how often people exclusively use one or the other. And it
> paints an even starker picture. Doing some statistics:
> - It appears about 4,870 search results and 88 Scholar results from a
> UCT-based search mentioned both UTC and UCT, and about 330,000 search
> results and 300 Scholar results from a UTC-based search mentioned
> both.
> - If you convert those into percentages, I get about 50.8% of all
> search results and 25.6% of all Scholar results mentioning both in a
> UCT-based search, but only about 12.8% of all search results and 1.8%
> of all Scholar results mentioning both in a UTC-based search.
> Initially, I tried '"Universal Coordinated Time" UCT' without quoting
> 'UCT', and Google's search engine thought I meant to type 'UTC'
> instead, assuming some sort of mistake I'm guessing. This itself could
> be considered pretty telling. (It's also why I quoted both 'UCT' and
> 'UTC' in all four searches.) It's also telling that excluding the UTC
> acronym from the UCT search results took away literally over half of
> the search results.
> Note: I excluded the surrounding single quotes in each search.
> Just to reiterate, I'm just coming here curious why the two are
> distinct names in the database and curious if "fixing" the redundancy
> would break much, not necessarily saying it *has* to be changed. I
> have very little stake here personally.

113,000, 2,860, 1,610 for "Coordinated Universal Time" "CUT" on Google, Scholar,
and Books

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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