What is the precise definition of JDE’s Julian Date format?

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The JDE Julian date consists of CYYDDD which is Century, Year, Day of year.

Century is zero for 20th e.g. 19XX and one for 21st e.g. 20XX.

The year is two digits.
So 101001 is 1 January 2001

As you can see this will not support dates before 1900.

See this Oracle page for a simple and official explanation: About the Julian Date Format

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