Python common data type operations - time calendar

time module

1. Get the current timestamp.

The number of seconds from January 1, 1970, 0:0:0:0 in time zone 0, to the given date-time, as a floating-point number.

import time
print (time.time ())

1523587843.3224387

2. Get the time ancestor.

Many python time functions treat time as a tuple of 9 numbers, as shown below

time.localtime([seconds]), the default current timestamp.

>>> import time

>>> time.localtime()

time.struct_time(tm_year=2018, tm_mon=4, tm_mday=13,tm_hour=10, tm_min=59, tm_sec=54, tm_wday=4, tm_yday=103, tm_isdst=0)

3. Get the formatting time.

3.1 seconds -> readable

import time

time.ctime([seconds]), optional timestamp, default current timestamp

>>>import time

>>>time.ctime()

'FriApr 13 10:57:06 2018'

import time

time.asctime([p_tuple]), optional time tuple, default current time tuple

>>> importtime

>>>time.asctime()

'Fri Apr 13 11: 01: 592018'

4. Format date string <--> timestamp

4.1 Time tuple -> formatted date

time.strftime(format string, time tuple)

>>>time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())

'2018-04-1311:05:47'

4.2 Formatting date->time tuples

time.strptime(date string, format string)

time.mktime(time tuple)

>>>time.mktime(time.strptime("2017-09-02 17:21:00", "%Y-%m-%d%H:%M:%S"))

1504344060.0

>>>time.strptime("2017-09-02 17:21:00", "%Y-%m-%d %H:%M:%S")

time.struct_time(tm_year=2017,tm_mon=9, tm_mday=2, tm_hour=17, tm_min=21, tm_sec=0, tm_wday=5, tm_yday=245,tm_isdst=-1)

5. Get the current cpu time

time.clock( ), a floating-point number, can be used to count the execution time of a piece of program code

6. Sleep n seconds

Postponing the execution of threads can be simply understood as letting the program suspend

time.sleep(secs)

calendar module

Get a month's calendar

import calendar
print(calendar.month(2018,4))

datetime module

There are datetime classes in this module, and date classes and time classes are also commonly used.

1. Get today's date

>>> import datetime

>>>datetime.datetime.now()

datetime.datetime(2018, 4,13, 11, 18, 33, 996080)

>>>datetime.datetime.today()

datetime.datetime(2018, 4,13, 11, 18, 51, 252080)

2. Get the current year, month, day, hour, minute and second separately

year，month，day，hour，minute，second

>>> import datetime

>>>datetime.datetime.now().year

2018

3. Calculate the time after n days

>>> import datetime

>>>datetime.datetime.now()+datetime.timedelta(days = 7)

datetime.datetime(2018, 4,20, 11, 28, 53, 688080)

4. Obtain two time differences

5、              import datetime

first = datetime.datetime(2018,4,15,00,00,00)
second = datetime.datetime(2018,4,18,00,00,00)

result = second -first

print(result.total_seconds())

Python common data type operations - time calendar

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