On 21 Jan 2006 at 15:15, M. Warner Losh wrote:

> For some perspective, we've been using UTC for only ~50 years and the
> gregorian calendar for only ~1500 years.  I'd anticipate that
> something would need to be done about the slowing of the day well
> before 4300 years have passed.

Actually, that's more like ~400 years for the Gregorian calendar
(first instituted in 1582; adopted in different dates in different
countries, as late as the 1920s in some).  Its predecessor, the
Julian calendar, goes back ~2000 years.

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