1 Run a query that includes at least 1 date or time column.
e.g.
SELECT now() AS time_now , current_date AS todays_date;
2 copy data to clipboard in the UI

3 paste the data into excel
expect => pasted data should look reasonable.
actual => pasted data goes into excel wonky

Oh also - pasting Wagon data into Sheets totally works, so way to go Google.
Sad that Excel--the more established spreadsheet app--can't deal with dynamic data type discovery like Sheets.