Detailed introduction to time processing in Python

1. Two ways 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 last day of last month Date (the first day of the month minus 1 day)

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

print last

3. Get the time difference (the time difference unit is seconds, often used to calculate the time the program runs)

starttime = datetime.datetime.now( )

#long running

endtime = datetime.datetime.now()

print (endtime - starttime).seconds

4. Calculate the current time Time 10 hours back

d1 = datetime.datetime.now()

d3 = d1 + datetime.timedelta(hours=10)

d3.ctime()

The two commonly used classes are: datetime and timedelta. They can be added or subtracted from each other. Each class has some methods and attributes to view specific values. For example, datetime can view: days (day), hours (hour), day of the week (weekday()), etc.; timedelta can view: days (days), seconds Number (seconds) etc.

5. Time and date formatting symbols in python:

%y represents a two-digit year (00-99)

%Y represents a four-digit year ( 000-9999)

%m Month (01-12)

%d Day in the month (0-31)

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

%I 12-hour hours (01-12)

%M minutes (00=59)

%S seconds (00-59 )

%a Local simplified week name

%A Local complete week name

%b Local simplified month name

%B Local complete month Name

%c Local corresponding date representation and time representation

%j Day within the year (001-366)

%p Local equivalent of A.M. or P.M.

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

%w The number of weeks (0-6), Sunday is the beginning of the week

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

%x The corresponding local date representation

%X The corresponding local time representation

%Z The name of the current time zone

%% The number itself

Attached is the 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()

# Get the previous days of the given parameters Date, returns a list

def getDaysByNum(num):

today=datetime.date.today()

oneday=datetime.timedelta(days=1)

= []

for I in RANGE (0, NUM):

Today, one day,

## TODAY = TODAY-ONEDAY

#Convert the date into a string

#Result = Datetostr (TODAY)

## (Datetostr (TODAY))

## RETURN Li

#Convert the string into datetime type

def strtodatetime(datestr,format):

return datetime.datetime.strptime(datestr,format)

#Convert time into a string, the format is 2008-08-02

def datetostr(date):

return str(date)[0 :10]

#How many days are there between two dates, for example: 2008-10-03 and 2008-10-01 are two days apart

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 the times in the two time periods and return the 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

# Get the current year as a string

def getYear():

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

#Get the current month as a string

def getMonth():

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

# Get the current day as 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('2008-10-01','2008- 10-05')

print '2008-10-04 00:00:00'[0:10]

print str(getYear())+getMonth ()+getDay()

print getNow()

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