Circa AD 2000 to 2099: “How about 2019?” said Annie. This is the first time we’ve spotted a present-day date in the series, so we’ll assume all the books are set around 2019.
Timeline Models
Single Static Timeline: Within the series, anything the kids do seems to fit known history rather than change it.
From the magic tree house in Frog Creek, Pennsylvania, circa 2019 ⋙ to Philadelphia, Pennsylvania, [d]1787[/d]. Round trip. Note: Jack and Annie in the tree house to the US Constitutional Convention.