要从object更改为datetime64，您可以尝试以下操作：

import pandas as pd

data = {'date': ['2023-06-25T00:00:00.000Z']}
df = pd.DataFrame(data)

df['date'] = pd.to_datetime(df['date'])

df['date'] = df['date'].dt.strftime('%Y-%m-%d')

print(df)

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如果你使用df.info（），它会显示datetime64，而不是object

import pandas as pd

# Assuming 'df' is your DataFrame
# Convert 'date' column to datetime format
df['date'] = pd.to_datetime(df['date'])

# Extract only the date part and overwrite the 'date' column
df['date'] = df['date'].dt.date

# Now, 'date' column will contain only the date (yyyy-mm-dd)
print(df['date'])

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