Morpheus,
You misunderstood me. I'm talking about economic statistics, not account history.
https://secondlife.com/currency/economy-data.php
Turns out it's not reversed month and day, it's just a month behind.
Clicking "Raw Data" today gets me:
Economic Statistics (Raw Data Files)
Sunday, June 11, 2006
June 11... not July 11. It's a month behind.
You can select July 11 in "Older files". It's just defaulting to the wrong day.