Actually, Oracle's implementation is a Julian date.
The YYDDD format is most definitely not a Julian date, though
many persist in calling it that.
Oracle is using what is called a 'Modified Julian Date'. A Julian
date actually begins at Noon on -4712, which is 4713 BC.
That ordinal vs. cardinal number thing will get you every time. :)
http://tycho.usno.navy.mil/mjd.html
Jared
| DENNIS WILLIAMS <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 10/22/2003 09:44 AM
|
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> cc: Subject: RE: Boolean dates... |
I think this is very perceptive - Julian vs. Boolean. I just want to mention
that what Oracle calls a Julian date is the number of days since Jan 1, 4712
BC. As far as I know, that is exclusive to Oracle. Other systems define
Julian differently. IIRC, IBM mainframes call the number of days since the
most recent Jan. 1 is the Julian. Oracle uses the ddd format in to_char and
to_date functions for this, like today is the 295th day of 2003.
Dennis Williams
DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Wednesday, October 22, 2003 10:55 AM
To: Multiple recipients of list ORACLE-L
Jose Luis,
Is it possible that your boss actually means "Julian date",
not "boolean date"? If you speak the two phrase out loud,
there are enough similarities to allow mispronunciation or
misinterpretation?
I tried one of your date values and it didn't work out so
well, but if the format is _similar_ to the Julian format
employed by Oracle, you might have a better time searching
Google for "julian date" rather than "boolean date". Just
thinking out loud...
Here is what I got using one of the values you displayed:
SQL> select to_date(728283,'J') from dual;
TO_DATE(728
-----------
06-DEC-2719
And here is the Julian date value for today...
SQL> select to_char(sysdate,'J') from dual;
TO_CHAR
-------
2452935
Hope this helps...
-Tim
> Hi to all!
>
> We have an old app that manages something that my boss
> calls: boolean dates.
>
> He told me that exists an algorithm that manages dates
> as a boolean format.
>
> We have several tables in this form:
>
> Note: The following table: PAAM
> has the field BDATE defined as NUMBER.
>
> sql> select bdate from paam
> sql> where rownum < 6
>
> BDATE
> ----------
> 728464
> 728434
> 728403
> 728495
> 728283
>
> now, I need to convert that format to an
> 'understandable' format to get the old data and old
> dates.
>
> I'm looking (google-ing) for that subject but, without
> luck.
>
> any ideas? help?, pls...
>
> Thanks in advance
>
> Regards!
> JL
>
>
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