Oracle julian date conversion

Oracle julian date conversion DEFAULT

&#;In Oracle, I wanted to convert Julian date with value to actual date time &#; 9/2/ AM&#;

That&#;s because the 2nd query is trying to convert the Julian date &#;&#; to a &#;normal&#; date, whereas the 1st query is saying take the string in format MMDDYY and convert it into a &#;normal&#; date.

It sounds like Devayani already has the Julian date (probably not in an Oracle date/time field) and is trying to convert it into a date/time.

Regards
Jules

From: kanchamreddy via oracle-sql-l [mailto:[email protected]]
Sent: 09 March
To: Van Tienhoven Julian (NHS Connecting for Health)
Subject: RE:[oracle-sql-l] In Oracle, I wanted to convert Julian date with value to actual date time &#; 9/2/ AM

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Posted by kanchamreddy
on Mar 9 at AM

[http://images.ittoolbox.com/vt/icons/vote.png]Mar k as helpful<http://it.toolbox.com/api/ContentVote/ 84/1/1/>

Hi,

I am unable to get the same solution by using below two functions.

select to_date(&#;&#;, &#;MMDDYY&#;) from dual &#;result: JUL
select to_date(,&#;J&#;) from dual &#;ResultFEB

Sours: https://www.toolbox.com/tech/oracle/question/in-oracle-i-wanted-to-convert-julian-date-with-valueto-actual-date-timeam/

C Julian Date Conversion Charts

C.1 About the Julian Date Format

Date fields in JD Edwards World files are stored in the Julian format. Program X converts these dates into the Gregorian format so they are easily recognized in World software applications.

If you are performing date calculations in World Writer, you may be required to use the Julian date value. These conversion charts will assist in determining the value to enter.

They are also useful when viewing Julian date fields in applications outside of JD Edwards World that do not convert Julian to Gregorian.

The Julian (*JUL) date format is CYYDDD, where:

C is added to 19 to create the century, i.e. 0 + 19 = 19, 1 + 19 = YY is the year within the century, DDD is the day in the year.

C Examples

Julian DateGregorian Date
July 4,
Jan. 1,

Sours: https://docs.oracle.com/cd/E_01/doc/e/julian_date_conv.htm
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Julian days are the number of days since January 1, BC. It is represents as a number. So every date since January 1, BC can be represented as a number, which is called Julian Date.

Examples:-

SQL > select to_char(sysdate,&#;J&#;) as julian from dual; 

JULIAN
&#;&#;-

SQL > select to_char(to_date(&#;Jan&#;,&#;dd-mon-yyyy&#;),&#;J&#;) as julian from dual;

JULIAN
&#;&#;-

SQL > select to_char(to_date(&#;Jan BC&#;,&#;dd-mon-yyyy AD&#;),&#;J&#;) as julian from dual;

JULIAN
&#;&#;-

So Julian date starts on Jan BC.

Note :- &#;J&#; is the format string to convert date to Julian Date.

Convert Julian Date to date

&#;JSP&#; format string converts Julian Date to date.

Examples :-

SQL > select to_char(to_date(,&#;JSP&#;),&#;dd-Mon-yyyy&#;) as day  from dual;

DAY
&#;&#;&#;&#;
Jan

SQL > select to_char(to_date(1,&#;JSP&#;),&#;dd-Mon-yyyy AD&#;) as day  from dual;

DAY
&#;&#;&#;&#;&#;
Jan BC

Julian Date Usage

There are few situations Julian Date become handy. I have stated few examples.

1. Find number of days between two date

Below query finds days between Mar and Jan

select
to_char(to_date(&#;Jan&#;,&#;dd-mon-yyyy&#;),&#;J&#;) as start,
to_char(to_date(&#;Mar&#;,&#;dd-mon-yyyy&#;),&#;J&#;) as end,
(
to_char(to_date(&#;Mar&#;,&#;dd-mon-yyyy&#;),&#;J&#;)
&#;
to_char(to_date(&#;Jan&#;,&#;dd-mon-yyyy&#;),&#;J&#;)
) as difference
from dual;

START   END      DIFFERENCE
&#;&#;- &#;&#;- &#;&#;&#;-
     

2. File name generation based on date.
Assume marketing department sending the daily files to IT department in the format of julian date.
So I would say it is quite easy to interpret as a number though it as a date internally.
Say, &#;Sales_txt&#; may be a file generated on Jan and so so.

3. Simple Data security by encryption
Save all dob in Julian Date format in a number column. So non-tech savvy people cannot easily decode it

Update table set dob_number = to_char(dob,&#;J&#;);

Update table set dob = null;

dob_number is a char column
Note :- Examples are given for explanations only.

Did you find any other scenario ? Please comment.

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