On Mon, 4 Jan 1999, Tony Duell wrote:
Even if you set the date then there may not be
problems. If the date is
only used for 'cosmetic' purposes (heading a printout, something like
that), then it may be wrong, but the device will keep working.
The main problem comes when the date is used for
something more. And the
real problem comes when it's used for a maintenance timer. Some things,
lifts (elevators) being the most common example, have to be inspected
every so many days. And there's a timer in the control unit that shuts
them down - safely (go to ground floor, open doors) if this timer
expires. The timer is reset by the service engineer when he does the
inspection, of course.
Now, on most such systems the timer is a simple day counter. And AFAIK
counting days does not depend on the month or year, or anything else. So
they keep working as ever. To do it this way is simple, it takes little
programming (to work out a date 90 days in the future is a lot more work
than counting to 90), and it doesn't suffer from problems.
The only thing I can think of where a date issue would cause a system to
be Y2K non-compliant is something that tracks days throughout the year,
and thus would need to know if February is 28 or 29 days this year.
For the average person, the only thing that might have
problems is the
VCR. I personally wouldn't try to set the timer past the year 2000. I'd
not try to automatically record a programme over 01/01/2000 00:00. I'd do
it by hand. Realistically, though, most VCRs don't have problems.
Paradoxically, the more intellegent ones - the ones with barcode
programming, video+, automatic dayname setting based on the date are more
likely to have problems than the older ones.
The VCR I bought in 1993 (Panasonic) has a 4-digit year field for
programming, and does go to 2000 and beyond.
Sellam Alternate e-mail: dastar(a)siconic.com
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