When I use a Custom Field with a date picker and put in 30 September 2033 (30/Sep/2033) and export it to a csv file, it converts the date to 30 September 1933 (30/Sept/1933).
Thank you for reaching out to Atlassian Community and for bringing up this bug to our attention.
I was able to test here and replicated the issue.
It happens if we add any year after 2030 and on the old view it shows incorrectly on the UI and when we export. On the new view, the issue doesn't happen, but if we export it will show the wrong year.
I created a bug for our dev team to check:
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