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

From: Henry Poras <Henry.Poras_at_ctp.com>
Date: Wed, 19 Dec 2001 12:18:33 -0800
Message-ID: <F001.003E0953.20011219120238@fatcity.com>

Ah,
but check 10/5-16/1582 for Oracle. That is when the Gregorian calandar was adopted. 1752 is just for England (I believe). <SPAN
class=378495619-19122001> 
<SPAN
class=378495619-19122001>Henry

<FONT face=Tahoma

  size=2>-----Original Message-----From: Robertson Lee - lerobe   [mailto:lerobe_at_acxiom.co.uk]Sent: Wednesday, December 19, 2001   12:09 PMTo: Multiple recipients of list ORACLE-LSubject:   RE: Mabye OT: Was Re: Different clocks for different   instances.
  Well
  I say,
<SPAN

  class=484380617-19122001> 
  that
  is also the case on Tru64 as well.
<SPAN

  class=484380617-19122001> 
  How
  pedantic is UNIX ??
<SPAN

  class=484380617-19122001>       

    <FONT face=Tahoma
    size=2>-----Original Message-----From: Brian McGraw     [mailto:Brian.McGraw_at_infinity-insurance.com]Sent: 19 December     2001 16:16To: Multiple recipients of list     ORACLE-LSubject: Mabye OT: Was Re: Different clocks for different     instances.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 <A     href="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)   <A 
      href="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  |  
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                <A 
      href="http://staff.scu.edu.au/asu/index.html">http://staff.scu.edu.au/asu/index.html 

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    | Brian McGraw     --     Oracle
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