how to set date as index in pandas in python

main.py
import pandas as pd
from datetime import datetime

# create a DataFrame with dates as a column
data = {'date': [datetime(2021, 1, 1), datetime(2021, 1, 2), datetime(2021, 1, 3)],
        'value': [10, 20, 30]}
df = pd.DataFrame(data)

# set the date column as the index
df.set_index('date', inplace=True)

print(df)
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main.py
            value
date             
2021-01-01     10
2021-01-02     20
2021-01-03     30
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