Python time和datetime模块

time模块

time() -- return current time in seconds since the Epoch as a float
clock() -- return CPU time since process start as a float
sleep() -- delay for a number of seconds given as a float
gmtime() -- convert seconds since Epoch to UTC tuple
localtime() -- convert seconds since Epoch to local time tuple
asctime() -- convert time tuple to string
ctime() -- convert time in seconds to string
mktime() -- convert local time tuple to seconds since Epoch
strftime() -- convert time tuple to string according to format specification
strptime() -- parse string to time tuple according to format specification
tzset() -- change the local timezone

time() -- return current time in seconds since the Epoch as a float

sleep() -- delay for a number of seconds given as a float

print (time.time())
print (time.sleep(3))
print (time.time())
结果：
1463616112.13201
None
1463616115.132182

gmtime() -- convert seconds since Epoch to UTC tuple

print (time.gmtime(1463616204.311283))
print (time.gmtime(time.time()))
结果：
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=19, tm_hour=0, tm_min=3, tm_sec=24, tm_wday=3, tm_yday=140, tm_isdst=0)
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=19, tm_hour=0, tm_min=4, tm_sec=15, tm_wday=3, tm_yday=140, tm_isdst=0)

localtime() -- convert seconds since Epoch to local time tuple

print (time.localtime())
print (time.localtime(1463616204.311283))
结果：
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=19, tm_hour=8, tm_min=6, tm_sec=26, tm_wday=3, tm_yday=140, tm_isdst=0)
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=19, tm_hour=8, tm_min=3, tm_sec=24, tm_wday=3, tm_yday=140, tm_isdst=0)

asctime() -- convert time tuple to string

print (time.time())
print (time.asctime())
print (time.asctime(time.localtime(1463616204.311283)))
结果：
1463616842.655794
Thu May 19 08:14:02 2016
Thu May 19 08:03:24 2016

def strftime(format, p_tuple=None):

a = time.localtime(1363616204.311283)
print (a)
print (time.strftime('%Y%m%d',a))
结果：
time.struct_time(tm_year=2013, tm_mon=3, tm_mday=18, tm_hour=22, tm_min=16, tm_sec=44, tm_wday=0, tm_yday=77, tm_isdst=0)
20130318

def strptime(string, format):

print (time.strptime("20130318","%Y%m%d"))
a = time.strptime("20130318","%Y%m%d")
print (type(a))
print (a.tm_mday)

结果： 

  time.struct_time(tm_year=2013, tm_mon=3, tm_mday=18, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=0, tm_yday=77, tm_isdst=-1)
  <class 'time.struct_time'>
  18

def mktime(p_tuple):
print (time.gmtime())
print (time.mktime(time.gmtime()))
结果：
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=19, tm_hour=0, tm_min=47, tm_sec=21, tm_wday=3, tm_yday=140, tm_isdst=0)
1463590041.0