pandas.to_datetime: Combine data from 2 columns

[ju21878436312]

I would like to combine data from 2 columns

The file "minimal_in.csv" is the following:

Year,Time
29.01.2001,13:31:24
29.01.2001,13:31:27
29.01.2001,13:31:29
29.01.2001,13:31:32
29.01.2001,13:31:34

I have first tried:

import pandas as pd
from datetime import datetime, timedelta

import pandas as pd

df = pd.read_csv('minimal_in.csv')
df.head(5)

df[['Year','Time']].apply(pd.to_datetime)
df.dtypes

or alternatively:

df_combine = df['Year','Time']
pd.to_datetime(df_combine)

Has someone an idea? I would be very grateful