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Some shared decks include cards/notes with invalidate creation dates, eg they say cards were created in the year 40000 instead of the year 2023. This causes a variety of problems, and causes any cards created after importing such a deck to end up with similarly-invalid timestamps. To prevent this problem spreading, recent Anki versions will refuse to export decks that have invalid dates.

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When exporting

If you receive this message when exporting, you can fix it using one of the following methods:
  • On a 2.1.61+ computer version, use the Tools>Check Database menu item.
  • On AnkiMobile 2.0.90+, use Check Database in the preferences screen.

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When importing

The Anki versions mentioned in the previous section can now automatically fix problem decks when importing.