https://www.runoob.com/python/att-time-strftime.html

把datetime对象变成各式各样的字符串~~~~~~~

python
from datetime import datetime
time = datetime.now()
print(time)
print(time.replace(minute=0, second=0, microsecond=0))
print(time.strftime("%Y-%m-%d nihao %H:%M:%S"))
print(time.strftime("%j"))  # 今天是今年的第几天 001到366
print(time.strftime("%w"))  # 今天是星期几 星期日是第0天 0到6
time1 = datetime(2020, 1, 1)
print(time1.strftime("%j"))  # 今天是今年的第几天 001到366 

2020-12-07 14:25:57.538141

2020-12-07 14:00:00

2020-12-07 nihao 14:25:57

342

1

001

把字符串提取解析出datetime对象~~~~~

https://www.runoob.com/python/att-time-strptime.html

python
import datetime
t=datetime.datetime.strptime('2013-12-30T13:00+08:00', "%Y-%m-%dT%H:%M+08:00")
print(t)