add tag
Imagine I have the following pivot_table from pandas:

1	1	4009.225
	2	4247.400
	3	4500.900
	4	4571.350
	5	4603.625

It was created using 
where `birth2.index` came from a [pandas.to_datetime function](

I want to name the indices of this pivot_table `Month` and `Day`.

To that effect, I've tried `"month","day")` without success... 

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