解析pandas中的特定日期和时间顺序

import pandas as pd

date_str = '2022-01-01'
date = pd.to_datetime(date_str)
print(date)

2022-01-01 00:00:00

import pandas as pd

date_int = 20220101
date = pd.to_datetime(date_int, format='%Y%m%d')
print(date)

2022-01-01 00:00:00

import pandas as pd

datetime_str = '2022-01-01 12:34:56'
datetime = pd.to_datetime(datetime_str)
print(datetime)

2022-01-01 12:34:56

import pandas as pd

dates = ['2022-01-01', '2022-02-01', '2022-03-01']
date_series = pd.to_datetime(dates)
print(date_series)

DatetimeIndex(['2022-01-01', '2022-02-01', '2022-03-01'], dtype='datetime64[ns]', freq=None)