Python learning process (11) Date and time

This section describes how the Python application processes time and date. The conversion date format is the most commonly used feature.

(1) Get timestamp:

Python provides a time and calendar module that can be used to format dates and times.

The function time.time () is used to get the current timestamp:

Import time >>> tickets=time.time ()print" current timestamp is:"  1469240559.05

Attention:

1. The time interval is a floating-point decimal in seconds.

2. Each timestamp is indicated by how long it has been since midnight January 1, 1970 (calendar).

3. Timestamps can only be displayed from 1970 to 2038.

(2) Time tuple and get current time:

Many Python functions use a single element to assemble 9 sets of digital processing time:

This meta-ancestor is a struct_time tuple:

Get the current time and convert to a time tuple:

Import time >>> tickets=time.time ()print" current timestamp is "  1469241472.95>>> localtime=time.localtime (tickets)print" local time  ", LocalTime local time time.struct_time (tm_year=2016, tm_mon=7, tm_mday=23, tm_hour=10, tm_min =37, tm_sec=52, tm_wday=5, tm_yday=205, tm_isdst=0)

(3) Format time:

1) Get the formatted time directly:

>>> formtime=time.asctime (Time.localtime (Time.time ()))print" local time is: "  23 10:48:42 2016

2) arbitrarily get the formatted time:

>>>Import Time>>> localtime=Time.localtime (Time.time ())
#1. Format to date and time>>>PrintTime.strftime ("%y-%m-%d%h-%m-%s", localtime)2016-07-23 10-52-31
#2. Format to the day of the week month >>> minutePrintTime.strftime ("%a%b%d%h:%m:%s%Y", Time.localtime ()) Sat Jul10:55:59 2016>>>PrintTime.strftime ("%a%b%d%h:%m:%s%Y", LocalTime) Sat Jul23 10:52:31 2016
#3. Change the formatted time tuple back to a timestamp >>>PrintTime.mktime (Time.strptime (Time.strftime ("%a%b%d%h:%m:%s%Y"),"%a%b%d%h:%m:%s%Y"))1469242747.0

Python format symbols in time Date:

%y Two-digit year representation (00-99)%Y Four-digit year representation (000-9999)%m Month (01-12)One day in%d months (0-31)%H 24-hour hours (0-23)%I 12-hour hours (01-12)%M minutes (00=59)%s seconds (00-59)%a local simplified week name%A Local Full week name%b Local simplified month name%B Local Full month name%c Local corresponding date representation and time representation%j Day of the Year (001-366)%p equivalent of local a.m. or P.M.%u days of the year (00-53) Sunday for the beginning of the week%w Week (0-6), Sunday for the beginning of the week%W number of weeks in the year (00-53) Monday for the beginning of the week%x Local corresponding date representation%X Local corresponding time representation%Z name of the current time zonePercent% of the number itself

(4) Get a calendar for a month:

The Calendar module has a wide range of methods for working with calendar and monthly calendars, such as printing a month's monthly calendar:

Import Calendar>>> cal=calendar.month (2016,10)print  cal    Mo Tu We  Th Fr Sa Su                1  2 3  4  5  6  7  8  910 11 12 13 14 15 1617 18 19 20 21 22 2324 25 26 27 28 29 3031

The time module and the date module also have many built-in functions for processing time and conversion time, which are not described here.

Python learning process (11) Date and time