Re: Mabye OT: Was Re: Different clocks for different instances.

Welllllllllllll..... I feel enlightened.

And more secure! Now the Y1752 / Y1582 bugs won't bite me either! : )

"Schilling, Ben" wrote:

> Oracle uses the original start date of the Gregorian calendar in October
> 1582:
>
> 1* select to_date('04-OCT-1582'), to_date('04-OCT-1582')+1 from dual
> devp> /
>
> TO_DATE('04-OCT-1582 TO_DATE('04-OCT-1582
> -------------------- --------------------
> 04-OCT-1582 00:00:00 15-OCT-1582 00:00:00
> Ben Schilling
> Telecomm Manager
> Office of the Commissioner of Insurance
> 608-266-1615 ben.schilling_at_oci.state.wi.us
>
> -----Original Message-----
> Sent: Wednesday, December 19, 2001 11:09 AM
> To: Multiple recipients of list ORACLE-L
>
> Well I say,
>
> that is also the case on Tru64 as well.
>
> How pedantic is UNIX ??
>
>
> -----Original Message-----
> Sent: 19 December 2001 16:16
> To: Multiple recipients of list ORACLE-L
>
> Speaking of the system clock, here's something interesting that I stumbled
> across a few years back...
>
> Background: For those of you who may not know, the Julian calendar was
> abandoned by England, in favor of the Gregorian calendar, in 1752 because of
> date discrepancies. To facilitate this, September 3 - 13 were eliminated.
> This is actually reflected in UNIX (well, Solaris anyway) by issuing the
> 'cal 1752' command and looking at the month of September:
>
> Jul Aug Sep
> S M Tu W Th F S S M Tu W Th F S S M Tu W Th F S
> 1 2 3 4 1 1 2 14 15 16
> 5 6 7 8 9 10 11 2 3 4 5 6 7 8 17 18 19 20 21 22 23
> 12 13 14 15 16 17 18 9 10 11 12 13 14 15 24 25 26 27 28 29 30
> 19 20 21 22 23 24 25 16 17 18 19 20 21 22
> 26 27 28 29 30 31 23 24 25 26 27 28 29
>
> More info. on why the switch over occurred is available at
> http://www.bicknell.net/books/pc1981/p_calender.htm
> <http://www.bicknell.net/books/pc1981/p_calender.htm> , for those of you
> with morbid curiosity.
>
> Anyway - I was doing some Y2K testing a few years back, and playing with
> NLS_DATE_FORMAT queries when I learned this little tidbit. I decided to
> test the Oracle date formats because - hey - they'll be okay because they're
> based on Unix, right?
>
> Wrong: Issue the following query:
>
> select sysdate
> ,add_months(sysdate,-2988)
> ,add_months(sysdate,-2988) - 10
> from dual;
>
> And see the following results:
>
> SYSDATE ADD_MONTHS(SYSDATE,- ADD_MONTHS(SYSDATE,-
> -------------------- -------------------- --------------------
> 19-DEC-2001 10:07:02 19-DEC-1752 10:07:02 09-DEC-1752 10:07:02
>
> The third column represents a date which, technically, does not exist. : )
>
> Brian
>
> Kimberly Smith wrote:
>
> Oracle uses the system clock. So I would have to say no.
>
> -----Original Message-----
> Pollard
> Sent: Tuesday, December 18, 2001 6:50 PM
> To: Multiple recipients of list ORACLE-L
>
> Gooday Oraclers,
> is it possible to have different instances, on the same dB server,
> operating with different clocks - ie different date/times?
>
> Environment: Compaq-Digital Tru64 Unix, Oracle 8.0.6, DS20
>
> ---
> Kevin Pollard | PODBA (Pretend Oracle DBA)
> mailto:kpollard_at_scu.edu.au <mailto:kpollard_at_scu.edu.au> |
> Administrative Systems Unit
> Phone:+61 (02) 6620 3969 | Southern Cross University
> FAX:+61 (02) 6626 9122 | P.O. Box 157
> Room: R1-40a | Lismore NSW 2480, Australia
> http://staff.scu.edu.au/asu/index.html
> <http://staff.scu.edu.au/asu/index.html>
>
> --
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> Author: Kevin Pollard
> INET: kpollard_at_scu.edu.au
>
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> --------------------------------------
> | Brian McGraw -- Oracle DBA |
> | Central Alabama Oracle Users Group |
> |------------------------------------|
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> Author: Schilling, Ben
> INET: Ben.Schilling_at_oci.state.wi.us
>
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--
--------------------------------------
| Brian McGraw     --     Oracle DBA |
| Central Alabama Oracle Users Group |
|------------------------------------|
| mailto:BMcGraw_at_mindspring.com      |
| http://bmcgraw.home.mindspring.com |
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  INET: Brian.McGraw_at_infinity-insurance.com

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