From: Art Roberts (robertar@UMDNJ.EDU)
Date: Fri Nov 20 1998 - 18:08:43 EST
On Wed, 18 Nov 1998, CATHARINE S. FRITSCHI wrote:
>
> In lieu of purchasing a new Macintosh platform in order to be Y2K
> Compliant on our backup FacScan, we are going to attempt simply
> backdating our Consort 32 system clock / calendar.
>
> Does anyone know of a previous leap year that "matches" 2000 for days
> of the week? Thanks...
>
> Cathy Fritschi
> Sentara Norfolk General Hospital
> Norfolk, VA
>
Please ignore my first premature attempt at solving the problem. It
clearly does not work. Instead, look at the problem this way:
Every 4 years puts us ahead 5 days in the day of the week, or 5/4 days
ahead per year. Since you want to be in the same day of the week in some
year that is a multiple of four (another leap year) from the leap year of
interest (2000), then any multiple of four (4,8,12,etc.) whose product
with 5/4 is also an even multiple of 7, gives the number of years you need
to subtract to be in a match year. So....
5/4 x 28 = 7
Try 2000 - 28 = 1972.
Art Roberts
Dept. of Medicine
Robert Wood Johnson Medical School
email: robertar@umdnj.edu
phone: 732-235-7790
Fax: 732-235-7792
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