选择数据 - df.nlargest() - 最大最小时间

获得最大最小时间

https://deepinout.com/pandas/pandas-questions/544_pandas_getting_min_and_max_dates_from_a_pandas_dataframe.html#google_vignette

## 时间的话，前提是转成时间格式
df["date"] = pd.to_datetime(df["date"])
max_date = df.nlargest(1, 'date')
min_date = df.nsmallest(1, 'date')
print('Minimum date in dataframe:', min_date['date'].values[0])
print('Maximum date in dataframe:', max_date['date'].values[0])

结果：
Minimum date in dataframe: 2021-01-01
Maximum date in dataframe: 2021-01-04