Up to, and including, Mon 30-May-22, when the "Download your usage data" was selected on the USAGE webpage, the file that was downloaded was a standard CSV file that could be easily read with Excel or any text editor.
For some reason on Tue 31-May, the downloaded file was changed to be a ZIP file, but without a filetype included in the downloaded filename, which is only a slight nuisance.
When the CSV file is extracted from the ZIP folder, it is a load of rubbish. Some of the start dates are in American format (m/d/y) whilst other dates are in English format (d/m/y). Please note that before the ZIPping started the dates in the files were all consistently in English format. Does AGL know the Australian date standard format is d/m/y? If yes, then why the heck would AGL provide a file with mixed date formats?
The extracted CSV file "grows" in size each day it is downloaded, but ever since the data for Tue 31-May-22 (displayed as 5/31/2022) was included in the "new" ZIP download, there has been NO more daily usage figures included in the file, i.e. Wed 1-Jun-22 and Thu 2-Jun-22 are all missing. I suspect that if AGL find the missing readings, that they will then be provided in American date format.
PS -- I know AGL have the "missing" (from the download) data/readings, because they are displayed in the account usage webpage.