On 17/09/2012, G. Ken Holman <gkholman(_at_)cranesoftwrights(_dot_)com> wrote:
At 2012-09-17 20:01 +0000, Costello, Roger L. wrote:
xs:date('2012-09-10+14:00') lt xs:date('2012-09-11-14:00')
September 10, 2012 plus 14 hours is less than September 11, 2012
minus 14 hours?
As I calculate it,
September 10, 2012 plus 14 hours is 2:00 PM on September 10, 2012
and
September 11, 2012 minus 14 hours is 10:00 AM on September 10, 2012
No?
No, not at all. Your mistake is that it isn't a calculation.
Well, it is, in a way, but the time zone offset must be *subtracted*
in order to arrive at comparable values.
The +14:00 is not a time delta, it is an indication of where in the
world the date you have is found. And I'm not sure +/- 14:00 is
allowed ... I think time zones only go up to +/-13:00. Ah, I'm
wrong, there is a +14:00, and there is a -12:00, but nothing beyond:
http://en.wikipedia.org/wiki/UTC%2B14:00
http://en.wikipedia.org/wiki/UTC-12:00
XML Schema Part 2 permits +/- 14:00, noting that "future local laws"
might make use of this full range.
-W
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