import datetime
import time
#獲取當前時間
datetime.datetime.now()
#獲取當前日期
datetime.date.today()
#字串轉換為時間格式
>>> t = time.strptime("2009-08-08", "%y-%m-%d")
>>> y,m,d = t[0:3]
>>> datetime.date(y,m,d)
datetime.date(2009, 8, 8)
>>> datetime.datetime(y,m,d)
datetime.datetime(2009, 8, 8, 0, 0)
#返回前一天的日期
>>> import datetime
>>> today = datetime.date.today()
>>> days = datetime.timedelta(days=1)
>>> print today
2010-04-15
>>> print days
1 day, 0:00:00
>>> print today-days
2010-04-14
#datetime 物件獲取當天日期
>>> now = datetime.datetime.now()
>>> today = now.date().today()
>>> print today
2010-04-15
>>> print now
2010-04-15 14:41:21.421000
獲取時間戳
>>> time.time()
1446885023.80355
時間戳轉換時間
>>> time.strftime('%y-%m-%d %h:%m:%s', time.localtime(time.time()))
'2015-11-07 16:32:45'
時間轉換時間戳
>>> time.mktime(time.strptime('2015-11-06 16:30:00','%y-%m-%d %h:%m:%s'))
1446798600.0
獲取年與日時分秒
>>> time.strftime("%y-%m-%d %h:%m:%s", time.localtime())
'2015-11-07 16:45:46'
>>> print (time.strftime("%y-%m-%d %x", time.localtime()))
2015-11-07 16:52:31
獲取微妙(百萬分之一秒)
>>> datetime.datetime.now().microsecond
獲取時間+微秒數
>>> now = datetime.datetime.now()
>>> "%s.%s" % (now.strftime('%y%m%d%h%m%s'), now.microsecond)
'20151107172412.390765'
python格式化日期時間的函式為datetime.datetime.strftime()；由字串轉為日期型的函式為：datetime.datetime.strptime()，兩個函式都涉及日期時間的格式化字串，列舉如下：
%a abbreviated weekday name
%a full weekday name
%b abbreviated month name
%b full month name
%d day of month as decimal number (01 - 31)
%h hour in 24-hour format (00 - 23)
%i hour in 12-hour format (01 - 12)
%j day of year as decimal number (001 - 366)
%m month as decimal number (01 - 12)
%m minute as decimal number (00 - 59)
%p current locale's a.m./p.m. indicator for 12-hour clock
%s second as decimal number (00 - 59)
%u week of year as decimal number, with sunday as first day of week (00 - 51)
%w weekday as decimal number (0 - 6; sunday is 0)
%w week of year as decimal number, with monday as first day of week (00 - 51)
%x date representation for current locale
%x time representation for current locale
%y year without century, as decimal number (00 - 99)
%y year with century, as decimal number
%z, %z time-zone name or abbreviation; no characters if time zone is unknown
%% percent sign
例子：字串轉換成datetime
>>> c = datetime.datetime.strptime('sep-21-09 16:34','%b-%d-%y %h:%m');
>>> c
datetime.datetime(2009, 9, 21, 16, 34)
datetime轉換成字串
>>> datetime.datetime.now().strftime('%b-%d-%y %h:%m:%s');
'sep-22-09 16:48:08'
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