'Matching closest values placed at different places by day in a dataframe time series

I would like to fit two columns of datas that are often missmatched by timestamp. For that I would like to align the values of the columns with the nearest value in the dataframe, in a same day. Here is an exemple.

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As you can, the values look similar, but are not in the right place. Someone could help me please? Sorry if the question has been already asked, but I have not find right toppics/answers.

Kind regards

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'Matching closest values placed at different places by day in a dataframe time series

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