A jira exported file shows dates (Created, Update, etc) starting with "20" for every issue. For example a date that is "12/Jan/22" would be "2012/01/22" in an excel spreadsheet that is exported from Jira.
You might want to check this documentation
https://support.atlassian.com/jira-cloud-administration/docs/configure-the-look-and-feel-of-jira-applications/
Where it describe how to change date / time format
Hope it helps
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