如何从matplotlib中的dataframe列生成x轴值？

import matplotlib.pyplot as plt
import pandas as pd

data = {'日期': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-04'],
        '销售额': [100, 150, 200, 120]}
df = pd.DataFrame(data)

df['日期'] = pd.to_datetime(df['日期'])

plt.plot(df['日期'], df['销售额'])

plt.gca().xaxis.set_major_formatter(plt.DateFormatter('%Y-%m-%d'))
plt.gca().xaxis.set_major_locator(plt.MaxNLocator(nbins=4))

plt.show()