Python time processing

Python time processing 1. two methods to get the current time:

Import datetime, time

Now = time. strftime ("% Y-% m-% d % H: % M: % S ")

Print now

Now = datetime. datetime. now ()

Print now

2. get the date of the last day of the last month (the first day of the month minus one day)

Last = datetime. date (datetime. date. today (). year, datetime. date. today (). month, 1)-datetime. timedelta (1)

Print last

3. get the time difference (unit: seconds, usually used for calculating the time when the program runs)

Starttime = datetime. datetime. now ()

# Long running

Endtime = datetime. datetime. now ()

Print (endtime-starttime). seconds

4. calculate the last 10 hours of the current time.

D1 = datetime. datetime. now ()

D3 = d1 + datetime. timedelta (hours = 10)

D3.ctime ()

Common classes include datetime and timedelta. They can be added or subtracted from each other. Each class has some methods and attributes to view specific values, such as datetime: day, hour, and weekday; timedelta can be viewed as days and seconds.

5. time and date formatting symbols in python:

% Y two-digit year (00-99)

% Y indicates the four-digit year (000-9999)

% M month (01-12)

One day in % d Month (0-31)

% H Hour in 24-hour format (0-23)

% I 12-hour (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 date and time

% J one day in the year (001-366)

% P local equivalent of A. M. or P. M.

% U number of weeks in a year (00-53) Sunday is the start of the week

% W week (0-6), Sunday is the beginning of the week

% W number of weeks in a year (00-53) Monday is the start of the week

% X local date representation

% X local time representation

% Z current time zone name

% Itself

Attached sample code:

Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/--> #-*-coding: UTF-8 -*-

Import datetime, calendar

Def getYesterday ():

Today = datetime. date. today ()

Oneday = datetime. timedelta (days = 1)

Yesterday = today-oneday

Return yesterday

Def getToday ():

Return datetime. date. today ()

# Obtain the date of the previous day of the given parameter and return a list

Def getDaysByNum (num ):

Today = datetime. date. today ()

Oneday = datetime. timedelta (days = 1)

Li = []

For I in range (0, num ):

# Subtract one day from today and one day from one day

Today = today-oneday

# Convert a date to a string

# Result = datetostr (today)

Li. append (datetostr (today ))

Return li

# Convert a string to the datetime type

Def strtodatetime (datestr, format ):

Return datetime. datetime. strptime (datestr, format)

# Convert time to string in the format of 2008-08-02

Def datetostr (date ):

Return str (date) [0: 10]

# How many days are two dates separated, for example, and?

Def datediff (beginDate, endDate ):

Format = "% Y-% m-% d ";

Bd = strtodatetime (beginDate, format)

Ed = strtodatetime (endDate, format)

Oneday = datetime. timedelta (days = 1)

Count = 0

While bd! = Ed:

Ed = ed-oneday

Count + = 1

Return count

# Get all time of two time periods and return list

Def getDays (beginDate, endDate ):

Format = "% Y-% m-% d ";

Bd = strtodatetime (beginDate, format)

Ed = strtodatetime (endDate, format)

Oneday = datetime. timedelta (days = 1)

Num = datediff (beginDate, endDate) + 1

Li = []

For I in range (0, num ):

Li. append (datetostr (ed ))

Ed = ed-oneday

Return li

# Retrieving the current year is a string

Def getYear ():

Return str (datetime. date. today () [0: 4]

# Retrieving the current month is a string

Def getMonth ():

Return str (datetime. date. today () [5: 7]

# Retrieving the current day is a string

Def getDay ():

Return str (datetime. date. today () [8: 10]

Def getNow ():

Return datetime. datetime. now ()

Print getToday ()

Print getYesterday ()

Print getDaysByNum (3)

Print getDays ('2017-10-01 ', '2017-10-05 ')

Print '2017-10-04 00:00:00 '[]

Print str (getYear () + getMonth () + getDay ()

Print getNow ()