Re: [LEAPSECS] GMT -> UTC in Australia

From: John Cowan <>
Date: Thu, 24 Feb 2005 11:43:18 -0500

Steve Allen scripsit:

> Yes. But I can't say whether they value the immediate practicality of
> uniform time over the need to change all time zones by an hour 600
> years from now, and more and more often after that.


Secular changes in time zones (if by "time zone" you mean "LCT - UTC",
as I suppose) are something we already know how to handle, as they must be
taken into account when determining historical UTC/GMT to LCT conversion.
Indeed, some countries jigger the dates of their semiannual time changes
annually, which is also a secular change in a small way.

In addition, there is no reason why all the world's time zones must
change in a synchronized way; ad hoc changes, as and when the problems
become irritating, will be sufficient. Some jurisdictions might choose
to change by half-hour offsets in only three centuries.

The legal documents I have inspected are quite careful about this: they
state things like lease expiration as "midnight, December 31, 2096, New
York time", abstaining from attempting to prescribe the definition of
"New York time" a century hence.

Only do what only you can do.               John Cowan <>
  --Edsger W. Dijkstra's advice   
    to a student in search of a thesis
Received on Thu Feb 24 2005 - 08:43:33 PST

This archive was generated by hypermail 2.3.0 : Sat Sep 04 2010 - 09:44:55 PDT