[enter image description here](https://i.stack.imgur.com/t91Gb.png)Please i am trying to name the index column but I can't. I want to be a able to name it such that I can reference it to view the index values which are dates. i have tried 

df3.rename(columns={0:'Date'}, inplace=True) but it's not working. 

Please can someone help me out? Thank you.