title: How to convert object to datetime Index
body: <p>I have dataframe with colum <code>date</code>. The values of the <code>Date</code> column is like <code>Index([2011-01-10], dtype='object')</code>. I want to convert to DateTime but I am not able to do this. I have tried <code>df["Date"] = pd.to_datetime(df["Date"])</code> but it did not work. Got an error <code>TypeError: &lt;class 'pandas.core.indexes.base.Index'&gt; is not convertible to datetime</code>. Can anyone help me in solving this?</p>