一. datetime模块
# datetime模块可以看成是时间加减的模块
import datetime
# 返回当前时间
print(datetime.datetime.now())
# 2020-03-30 20:13:32.448369
print(datetime.date.fromtimestamp(time.time()))
# 2020-03-30
# 当前时间+3天
print(datetime.datetime.now() + datetime.timedelta(3))
# 2020-04-02 20:16:19.337675
# 当前时间-3天
print(datetime.datetime.now() + datetime.timedelta(-3))
# 2020-03-27 20:16:43.518752
# 当前时间-3小时
print(datetime.datetime.now() + datetime.timedelta(hours=3))
#2020-03-30 23:17:12.126659
# 当前时间+30分钟
print(datetime.datetime.now() + datetime.timedelta(minutes=30))
# 2020-03-30 20:47:48.805502
# 时间替换
change_time = datetime.datetime.now()
print(change_time.replace(minute=20, hour=5, second=13))
# 2020-03-30 05:20:13.672926
