datetime

>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2017, 9, 30, 9, 6, 45, 542000)
>>> from datetime import datetime
>>> now=datetime.now()
>>> now
datetime.datetime(2017, 9, 30, 9, 6, 59, 310000)
>>> 
KeyboardInterrupt
>>> utcnow=datetime.utcnow()
>>>  utcnow
 
SyntaxError: unexpected indent
>>> 
KeyboardInterrupt
>>> utcnow
datetime.datetime(2017, 9, 30, 1, 7, 21, 933000)
>>> now.month
9
>>> now.year
2017
>>> d=datetime(2014,2,1)
>>> d
datetime.datetime(2014, 2, 1, 0, 0)
>>> d.isoformat()
'2014-02-01T00:00:00'
>>> d.isoweekday()
6
>>> 
KeyboardInterrupt
>>> s=datetime.strptime('2017/9/30','%Y/%m/%d')
>>> s
datetime.datetime(2017, 9, 30, 0, 0)
>>> datetime.strptime('2017年9月30日星期六','%Y年%m月%d日星期六')
datetime.datetime(2017, 9, 30, 0, 0)
>>> datetime.strptime('2017年9月30日星期六8时42分24秒','%Y年%m月%d日星期六%H时%M分%S秒')
datetime.datetime(2017, 9, 30, 8, 42, 24)
>>> datetime.strptime('9/30/2017','%m/%d/%Y')
datetime.datetime(2017, 9, 30, 0, 0)
>>> datetime.strptime('9/30/2017 8:42:50','%m/%d/%Y %H:%M:%S')
datetime.datetime(2017, 9, 30, 8, 42, 50)
>>> 

　　

• 将以下datetime类型转换成字符串：
  • 2017年9月28日星期4,10时3分43秒
    Saturday, September 30, 2017
    9/30/2017 9:22:17 AM
    September 30, 2017

 

 

 

from datetime import datetime
f1=datetime(2017,9,28,10,3,43)
print(f1.strftime('%Y年%m月%d日%A%H时%M分%S秒'))

f2=datetime(2017,9,30)
print(f2.strftime('%A,%B %d,%Y'))

f3=datetime(2017,9,30,9,22,17)
print(f3.strftime('%m/%d/%Y %I:%M:%S %p'))

print(f2.strftime('%B %d,%Y'))

 

 

 

 

• 用datetime类型的变量输出以下字符串：
  • 今天是2017年9月30日
    今天是这周的第？天 
    今天是今年的第？天 
    今周是今年的第？周 
    今天是当月的第？天

 

from datetime import datetime
now =datetime.now()
print(now.strftime('今天是%Y年%m月%d日'))
print(now.strftime('今天是这周的第%w天'))
print(now.strftime('今天是今年的第%j天'))
print(now.strftime('今周是今年的第%W周'))
print(now.strftime('今天是当月的第%d天'))