Ошибка Python DT Использование только с датскими значениями

# Your problem here may be that to_datetime silently failed so the dtype remained as str/object, 
# if you set param errors='coerce' then if the conversion fails for any particular string 
# then those rows are set to NaT.

df['Date'] = pd.to_datetime(df['Date'], errors='coerce')
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