Python learning (twenty) time module method

1. Time module

Timestamp 
formatted time in seconds since Unix year 1

1) Get the current timestamp

import time
 print (time.time()) #Get the current timestamp

2) output after some time

import time
time.sleep( 10 )
 print ( ' haha ​​' )   # print after 10 seconds

3) Get the formatted time

import time
today =time.strftime( ' %Y-%m-%d %H:%M:%S ' ) #Get the formatted time 
print (today)

4) The default time is the standard time zone

import time
print(time.gmtime())

5) Get the current time zone time

import time
 print (time.localtime()) #Get the time in the current time zone

6) Convert the timestamp to a time tuple, and then convert the time tuple to a formatted time

import time
s =time.localtime(1514198608) #Convert the timestamp to a time tuple 
print (time.strftime( ' %Y-%m-%d %H:%M:%S ' ,s)) #Then convert the time tuple Group conversion to formatted time

7) The current formatted time is returned by default. If a timestamp is passed in, convert the timestamp into a formatted time and return

import time

def timestamp_to_fomat(timestamp=None,format='%Y-%m-%d %H:%M:%S'):
    if timestamp:
        time_tuple=time.localtime(timestamp)
        res=time.strftime(format,time_tuple)
    else:
        res=time.strftime(format)
    return res

print(timestamp_to_fomat())
print(timestamp_to_fomat(1514198608))

8) Convert the formatted time to a time tuple, and then convert the time tuple to a timestamp

import time
tp =time.strptime( ' 2018-4-21 ' , ' %Y-%m-%d ' ) #Convert the formatted time into a time tuple 
print (time.mktime(tp)) #Convert the time element Convert groups to timestamps

9) The function does not pass parameters, returns the timestamp of the current time, and returns the timestamp of the parameter if the parameter is passed in

import time
def strTimestamp(str=None,format='%Y%m%d%H%M%S'):
    if str:
        tp =time.strptime(str,format) #Convert to time tuple 
        res=time.mktime(tp) #Convert to timestamp 
    else :
        res =time.time() #The timestamp of the current time is taken by default

    return int(res)
print(strTimestamp())
print(strTimestamp('20181229183859'))
print(strTimestamp('2018-12-29','%Y-%m-%d'))

2. datetime module

1) Get the current time

import datetime
 print (datetime.datetime.today()) #Get the current time

2) Get the time of the day, accurate to the day

import datetime
 print (datetime.date.today()) #accurate to days

3) Get the time after a few days

import datetime
res =datetime.date.today()+datetime.timedelta(days=5) #Get the time after 5 days 
print (res) #You     can also write minutes, weeks, seconds time

4) Get the time a few days ago

import datetime
res =datetime.date.today()+datetime.timedelta(days=-5) #Get the time 5 days ago 
print (res)

5) Get the time a few days ago (output format custom)

import datetime
res =datetime.date.today()+datetime.timedelta(days=-5) #Get the time 5 days ago 
print (res.strftime( ' %Y%m%d ' ))