Create Item suddenly returns Server Error

Did something change between April 24th and today?

curl --request POST \
  --url "https://app.startinfinity.com/api/v2/workspaces/{workspace_id}/boards/{board_id}/items" \
  --header "Authorization: Bearer {token}" \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --data '{
    "folder_id": "{folder_id}",
    "values": [
      {"attribute_id":"6c4eea2e-caf2-47cc-acd3-664b799f0cd7","data":"the user name"},
      {"attribute_id":"b92cd040-8e1e-420b-be31-67d3b71de447","data":"the project name"},
      {"attribute_id":"78843d40-d9bd-4890-b929-e719d57475a8","data":"the client name"},
      {"attribute_id":"83313c2b-20b9-48e7-8845-91d7619e5fce","data":"some long text"},
      {"attribute_id":"f0393adc-6125-4f64-8b10-bf497829698a","data":["a5104c2c-c506-4ed7-9aff-99c51f3a5b4d"]},
      {"attribute_id":"019d8a5f-17d5-7469-82e8-2de18b717b8e","data":"-"},
      {"attribute_id":"79221f5d-c7de-4995-b39a-3805f12e3930","data":"05\/20\/2026"},
      {"attribute_id":"019d613b-4479-722c-aea4-329fb0c21059","data":"2"},
      {"attribute_id":"019d613b-f229-722c-aea4-51953d037734","data":"2"},
      {"attribute_id":"019d613c-4548-722c-aea4-73fdabab18c0","data":"3"},
      {"attribute_id":"019d613c-c224-722c-aea4-93fa1546657a","data":"1"},
      {"attribute_id":"019d613d-d064-722c-aea4-b531ff423455","data":"3"}
    ]
  }'

It works when i changed the date format to 2026-05-20.

Did the format change? I swear it used to be DD/MM/YYY
The App UI shows:

Yes, sorry for that. It was never ment to accept arbitrary date formats, it was working by accident. The format that you are using now is the correct one.

Next time could you at least put it on the changelog if you wouldn’t notify the users. Thank you.