如何在pandas中删除0天并仅在数据帧中保留时间

import pandas as pd

df = pd.DataFrame({'日期': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-04'],
                   '数值': [10, 20, 30, 40]})

df['日期'] = pd.to_datetime(df['日期'])

df = df[df['日期'].dt.day != 0]

df['时间'] = df['日期'].dt.strftime('%H:%M:%S')

import pandas as pd

df = pd.DataFrame({'日期': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-04'],
                   '数值': [10, 20, 30, 40]})

df['日期'] = pd.to_datetime(df['日期'])
df = df[df['日期'].dt.day != 0]
df['时间'] = df['日期'].dt.strftime('%H:%M:%S')

print(df)