pandas to_datetime() then concat() on DateTime Index

Question

I\'m trying to merge 2 DataFrames using concat, on their DateTime Index, but it\'s not working as I expected. I copied some of this code from the example in the

Answer 1

You need axis=1:

pd.concat([df,df2], axis=1)

Output:

            value    0
2015-02-04    444  222
2016-03-05    555  333