python_时间处理

• 常用命令
• 转换

常用命令

时间戳：timestamp

import time as tm
now=tm.time()
print now
1501475503.61

日期时间：datetime、strftime

#datetime类型
import datetime as dt
now=dt.datetime.now()
print now
2017-07-31 12:27:07.250000

print type(now)
<type 'datetime.datetime'>

#字符串类型
import datetime as dt
now=dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
print now
2017-07-31 14:16:47

print type(now)
<type 'str'>

日期：date

#获取当日日期
now=dt.datetime.now().date()
print now
2017-07-31
print type(now)
<type 'datetime.date'>
#或者
now=dt.date.today()

#获取昨日日期
def getYesterday():  
  today=datetime.date.today() 
  oneday=datetime.timedelta(days=1) 
  yesterday=today-oneday  
  return yesterday 

转换

datetime-string

datetime -> string

>>> import datetime as dt
>>> dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
'2017-07-31 14:27:08'

string -> datetime

>>> import datetime as dt
>>> dt.datetime.strptime("2017-07-31 18:20:10", "%Y-%m-%d %H:%M:%S")
2017-07-31 18:20:10

datetime-timestamp

datetime -> timestamp

>>> now = dt.datetime.now()
>>> timestamp = time.mktime(now.timetuple())
>>> timestamp
1501476642.57

timestamp -> datetime

>>> dt.datetime.fromtimestamp(1501476642.57)
2017-07-31 12:50:42.570000

博文参考：http://blog.csdn.net/yl2isoft/article/details/52077991