I was caught out with a roll over in the German 40 index, so after the dust settled and I came to terms with my loss, I decided to make a note of the expiration date, so I could avoid it in the future (e.g. not trade on that day.). I put the entry in my trading log and the expiration displayed in the details pane was 15 DEC 2022 @noon.
Imagine my surprise on 10/11/2022 when the German 40 index rolled over and again caused a loss and it still showed the same expiry date of 15 Dec 2022 @noon.
Are the roll over and expiry dates different? why did it roll over a month before the displayed expiry date?