python之datetime

一.获取当前日期

>>> from datetime import datetime
>>> now=datetime.now()
>>> print now
2017-03-14 10:53:36.178612

二.日期格式化

1.datetime转换为str

>>> now2=now.strftime('%Y-%m-%d %H:%M:%S')               
>>> print now2
2017-03-14 10:53:36

2.str转换为datetime

>>> from datetime import datetime
>>> cday = datetime.strptime('2015-6-1 18:19:59', '%Y-%m-%d %H:%M:%S')
>>> print(cday)
2015-06-01 18:19:59

3.datetime转换为timestamp

>>> from datetime import datetime
>>> dt = datetime(2015, 4, 19, 12, 20) # 用指定日期时间创建datetime
>>> dt.timestamp() # 把datetime转换为timestamp
1429417200.0

4.timestamp转换为datetime

>>> from datetime import datetime
>>> t = 1429417200.0
>>> print(datetime.fromtimestamp(t))
2015-04-19 12:20:00

三.日期加减

>>> from datetime import datetime, timedelta
>>> now = datetime.now()
>>> now
datetime.datetime(2015, 5, 18, 16, 57, 3, 540997)
>>> now + timedelta(hours=10)
datetime.datetime(2015, 5, 19, 2, 57, 3, 540997)
>>> now - timedelta(days=1)
datetime.datetime(2015, 5, 17, 16, 57, 3, 540997)
>>> now + timedelta(days=2, hours=12)
datetime.datetime(2015, 5, 21, 4, 57, 3, 540997)

本文转自廖雪峰老师的python教程