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This can easily be done with user code to convert from this format to/from the supported Julian code and hence would be an unnecessary addition to the language. A small macro or inline function would suffice
https://docs.oracle.com/cd/E26228_01/doc.93/e21952/ap_dates.htm#WEAAS711
.1.1 Date Formats
Julian Format
The JD Edwards World Julian (*JUL) format is CYYDDD where:
•C is the value added to 19 to create the century (0=>19, 1=>20).
•YY is the year within the century.
•DDD is the day in the year which can range from 001 to 731(next year).
For Example:
•098185 is July 4, 1998
•100001 is Jan 1, 2000
•099666 is Oct 27, 2000
This is a Julian format.
This is a Julian format.
The first digit in the YYY format represents the century. I've been told this may be a DB2 convention, however I have no experience using DB2 so I can't confirm that.
001001 = 19010101
101001 = 20010101
121001 = 20210101
What is the meaning of the YYY in this proposed format? is 1989 to be held as 989 and 2021 as 021? and an example of where this format is generated would be helpful.
It would be useful to explain why this format is used, as it only seems to be a half-hearted attempt to fit formerly two-digit year (yymmdd) format dates into the same six bytes. Give that the simple addition of 1900000 will convert the date to a supported format, and having spent two years on Y2K conversion work, I would not be in favour of yet another date format.