Do you see something abnormal in following image?
Yes …….what’s this ……?
And same thing you will see on some other ERP solutions / software once you select September 1752.
Answer
The calendar snippet shows that there are no days between October 4 and October 15. This discontinuity is called the “cutover”.
What is Cutover
“This is a hybrid Julian/Gregorian calendar with a cutover on October 4/15 1582.” Any dates before a cutover are Julian, any dates during a cutover are nonexistent, and any dates after a cutover are Gregorian.
July 8, 2009 at 1:47 pm
as expected :
select date ‘1582-10-15′ – date ‘1582-10-04′ from dual
1
(only one day)
a bit more surprising :
select date ‘1582-10-15′ – date ‘1582-10-14′ from dual
-9
date ‘1582-10-14′ is an inexistent date that translate to “10 days after 4-OCT-1582″