• From: John Cowan <cowan@m...>
• To: Michael Kay <mike@s...>
• Date: Sat, 21 Apr 2012 16:03:32 -0400

Michael Kay scripsit:

> It's worth noting that whereas there is some kind of consensus on
> when seconds, minutes, hours, days, months, and years start and end
> (subject to timezone issues), there is no consensus on when a week
> starts or ends. 

There is, however, an ISO standard: weeks begin on Monday, and the first
week of the year is the week containing the first Thursday in January.
Thus 2005-01-01, a Saturday, is synonymous with 2005-W53-6, the sixth
day of the 53rd and last week of 2004.

Note that XSD time does not include leap seconds, which means that the
XSD 1.1 value space for durations contains <second, month> pairs.
There are a fixed number of seconds in a minute, hour, and day, and a
fixed number of months in a year.

-- 
"Repeat this until 'update-mounts -v' shows no updates.         John Cowan
You may well have to log in to particular machines, hunt down   cowan@c...
people who still have processes running, and kill them."

• References:
  • Incompleteness of Duration
    • From: "Toby Considine" <Toby.Considine@g...>
  • Re: Incompleteness of Duration
    • From: Michael Kay <mike@s...>