pandas处理日期函数

import pandas as pd
import dateutil

#获取当天的时间
curr_time = pd.datetime.today()

#对时间进行格式转换为yyyyMMdd
curr_date = pd.datetime.strftime(curr_time, "%Y%m%d")

#将日期减一天
before_1_curr_time = curr_time - dateutil.relativedelta.relativedelta(days=1)
#将日期加一天
after_1_curr_time = curr_time + dateutil.relativedelta.relativedelta(days=1)

#将日期形式的字符串转换为时间格式,得到的时间格式为'yyyy-MM-dd HH:mm:ss'
str = '2018-09-12 12:12:12'
str_to_time = pd.to_datetime(str)