python时间格式化/时间格式转换

"""获取某个时间"""
import datetime
import time
from dateutil import relativedelta

# 上月(eg: 202201)
last_month = (datetime.datetime.now() + relativedelta.relativedelta(months=-1)).strftime("%Y%m")

# 当月(eg: 202202)
issue_no = time.strftime("%Y%m")

# 下月(eg: 202203)
nextmonth = (datetime.date.today() + relativedelta.relativedelta(months=1)).strftime("%Y%m")

# 年月日（eg:2022-03-01）
now = datetime.datetime.now().strftime('%Y-%m-%d')
now = datetime.datetime.now().strftime("%Y%m%d")

# 年月日时分秒（eg:2022-03-01 00:00:00）
now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')

# 当月第一天，下月第一天
month_first_day = datetime.date(year=today.year, month=today.month, day=1)
next_clear_day = month_first_day + relativedelta(months=1)

# 3天前的日期  
threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3))  

# 31天后的日期
starttime = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
endtime = (datetime.datetime.now() + datetime.timedelta(days=31)).strftime('%Y-%m-%d 00:00:00')

"""时间转换"""
import time
import datetime

# 时间戳转字符串格式时间
timestamp = time.time()     # 当前时间戳
strtime = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(timestamp))

# 字符串格式时间转时间戳
now_str = "2022-03-09 00:00:00"
now_time = time.strptime(now_str,'%Y-%m-%d %H:%M:%S')
timestamp = time.mktime(now_time)

# python日期格式化
week = time.strftime("%A")