python - Why sort_index removes time portion of datetime columns?

Question

I have a dataframe with a datetimeIndex:

but when I try to sort this dataframe using sort_index() the time portion of all datetime columns (including the index) is removed. Why? How can I prevent it?
here's the code to sort:

data_date_index.sort_index(inplace=True)

and here's my dataframe after running the above line of code:

标签： pythonpandasdatetime

Answer 1

这很奇怪，但是当我data_date_index.head()在另一个单元格中运行时，它工作得很好（时间部分没有被删除）