Hi, @ddelsignor21.
If you want to get the axes of multiple plots to be the same, you can link the axes ranges.
If you want to control the format, and are seeing results that do not match your expectations, perhaps its due to the datasets taking on different timespans so the formatting being used is different.
Please see this related topic that discusses the multiple tickers that a datetime axes maintains.
Key point therein
You can think of it this way: a DateTime axis has multiple different tickers, and which one is active depends upon the scale of your current view of the figure.