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Re: DATE 5th OCT, 1582 not coming

From: Peter Johnson <johnson_at_humboldt.edu>
Date: Tue, 17 Oct 2000 09:52:14 -0500
Message-Id: <10652.119512@fatcity.com>


Sanjeev,

         The 5-Oct-1582 does not exist in the Gregorian calendar. The Pope decided that 4-Oct-1582 was followed by 15-Oct-1582. See below from http://www.genealogy.org/~scottlee/cal-overview.html

Gregorian calendar

Description

The Gregorian calendar is a modified version of the Julian calendar. The only difference being the specification of leap years. The Julian calendar specifies that every year that is a multiple of 4 will be a leap year. This leads to a year that is 365.25 days long, but the current accepted value for the tropical year is 365.242199 days.

To correct this error in the length of the year and to bring the vernal equinox back to March 21, Pope Gregory XIII issued a papal bull declaring that Thursday October 4, 1582 would be followed by Friday October 15, 1582 and that centennial years would only be a leap year if they were a multiple of 400. This shortened the year by 3 days per 400 years, giving a year of 365.2425 days.

Another recently proposed change in the leap year rule is to make years that are multiples of 4000 not a leap year, but this has never been officially accepted and this rule is not implemented in these algorithms.

At 07:35 AM 10/17/2000 -0800, you wrote:
>Here we are using following SQL:
>
>select to_date('5-OCT-1582','DD-MON-YYYY') from dual;
>
>which is returning 15-OCT-1582, instead of 05-OCT-1582
>
>Any Clue ?
>
>Sanjeev
>
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Sanjeev Sachdeva
> INET: sanjeevs_at_delhi.tcs.co.in
>
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Peter Johnson, DBA
Humboldt State University Received on Tue Oct 17 2000 - 09:52:14 CDT

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