如何在python中设置不同格式的日期变量？

import datetime

today = datetime.date.today()
print(today)  # 输出格式为YYYY-MM-DD

import datetime

date = datetime.date(2022, 1, 1)
print(date)  # 输出格式为YYYY-MM-DD

import datetime

now = datetime.datetime.now()
print(now)  # 输出格式为YYYY-MM-DD HH:MM:SS.ssssss

import datetime

time = datetime.time(12, 30, 0)
print(time)  # 输出格式为HH:MM:SS

import datetime

datetime = datetime.datetime(2022, 1, 1, 12, 30, 0)
print(datetime)  # 输出格式为YYYY-MM-DD HH:MM:SS.ssssss

import datetime

now = datetime.datetime.now()
formatted_datetime = now.strftime("%Y-%m-%d %H:%M:%S")
print(formatted_datetime)  # 输出格式为YYYY-MM-DD HH:MM:SS