Africa - data error
eggert at CS.UCLA.EDU
Mon Aug 23 17:52:52 UTC 2010
On 08/23/10 03:51, Jamie wrote:
> The International Atlas says that the city and country have observed
> a time zone of -1 (Central Europe Time) since 1960. Before that the
> time zone was 0 (UT).
My copy of the International Atlas (6th edition, dated 2003)
also says this:
Before 1 Jan 1912 LMT
Begin Standard 15W00
1 Jan 1912 0:00 1:00
Begin Standard 0W00
26 Feb 1934 0:00 0:00
which means that Niamey observed a time zone of -0100 (1 hour west of
UTC) between 1912 and 1934. This is the offset in question.
> The Wikipedia article on Niamey says
Wikipedia itself is not reliable on these issues, unless it cites
> The PC Atlas uses WAT for UTC-1...
> AstrolDeluxe displays West Central Africa Time (WCAT) = -1...
These are clearly invented abbreviations, just as the TZ abbreviation
is invented. Microsoft says that the "West Central Africa time zone"
is +0100 (1 hour east of UTC). See
<http://msdn.microsoft.com/en-us/library/dd796927.aspx>. All the
other uses of the phrase "West Central Africa time" (that I found with
Google) agree with Microsoft.
> Perhaps a different term (I propose WCAT) would straighten out the ambiguity
"WCAT" would be problematic for reasons described above. Ambiguity
per se is not a problem in the tz database, as it exists in many other
places (e.g., "EST" in the U.S. versus Australia). It's not entirely
clear that this Niamey time zone actually existed; it might just be a typo.
Until it's verified, it's not clear that it's worth the effort to
invent a new abbreviation for it.
More information about the tz