python中time模块与datetime模块的详解

时间上下限

import datetime
print 'min    :    ', datetime.datetime.min
print 'max    :    ', datetime.datetime.max 

min    :     0001-01-01 0
max    :     9999-12-31 23:59:59.999999 

datetime.datetime.now() 模块

import datetime
print '.now()       :    ', datetime.datetime.now()
print type(datetime.datetime.now())
print '.now().date():    ', datetime.datetime.now().date()
print type(datetime.datetime.now().date())
print '.strftime    :    ', datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
print type(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")) 

.now()       :     2017-09-06 19:46:23.099767<type 'datetime.datetime'>
.now().date():     2017-09-06<type 'datetime.date'>
.strftime    :     2017-09-06 19:46:23<type 'str'> 

获取单个时间信息

import datetime
print 'year   :    ', datetime.datetime.now().year
print 'month  :    ', datetime.datetime.now().month
print 'day    :    ', datetime.datetime.now().day
print 'hour   :    ', datetime.datetime.now().hour
print 'minute :    ', datetime.datetime.now().minute
print 'second :    ', datetime.datetime.now().second 

year   :     2017
month  :     9
day    :     6
hour   :     19
minute :     47
second :     13 

datetime 其他模块

import datetime
print '.time()      :    ', datetime.time()
print '.date.today():    ', datetime.date.today() 

.time()      :     0
.date.today():     2017-09-06 

计算非今日的时间信息

import datetime
print 'tomorrow:    ', datetime.date.today() + datetime.timedelta(days=1)
print 'tomorrow:    ', datetime.datetime.now() + datetime.timedelta(days=1)
print 'tomorrow:    ', (datetime.datetime.now() + datetime.timedelta(days=1)).strftime("%Y-%m-%d %H:%M:%S") 

tomorrow:     2017-09-07
tomorrow:     2017-09-07 19:49:16.292580
tomorrow:     2017-09-07 19:49:16 

time 模块 显示时间

import timeprint 'time.time()     :    ', time.time() # return当前时间戳
print 'time.localtime():    ', time.localtime() 

time.time()     :     1504698623.85
time.localtime():     time.struct_time(tm_year=2017, tm_mon=9, tm_mday=6, tm_hour=19, tm_min=50, tm_sec=23, tm_wday=2, tm_yday=249, tm_isdst=0) 

推迟线程调用

import time
time.sleep(2) # 延迟2秒 

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