Python Time processing

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 the month minus 1 days on the first day of the month

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

Print Last

3. Get the time difference (in seconds, often used to calculate when the program is running)

StartTime = Datetime.datetime.now ()

#long running

Endtime = Datetime.datetime.now ()

Print (endtime-starttime). seconds

4. Calculate the current time back 10 hours

D1 = Datetime.datetime.now ()

D3 = D1 + Datetime.timedelta (hours=10)

D3.ctime ()

The classes used in this book are: DateTime and Timedelta two. They can be added and reduced between each other. Each class has some methods and properties to view specific values, such as DateTime can be viewed: Days, hours (hour), Day of the Week (weekday ()), etc. timedelta can view: days, seconds (seconds), etc.

5.python Time Date formatting symbols:

%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 a locally simplified month name

%B Local Full month name

%c Local corresponding date representation and time representation

%j Day of the Year (001-366)

%p the equivalent of a local a.m. or p.m.

%u weeks of the year (00-53) Sunday is the beginning of the week

%w Week (0-6), Sunday for the beginning of the week

%W Week of the Year (00-53) Monday is the beginning of the week

%x Local corresponding date representation

%x Local corresponding time representation

%Z the name of the current time zone

Percent% of the number itself

Attach 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 ()

#获取给定参数的前几天的日期, returns a list

def getdaysbynum (num):

Today=datetime.date.today ()

Oneday=datetime.timedelta (Days=1)

Li=[]

For I in Range (0,num):

#今天减一天, day by day minus

Today=today-oneday

#把日期转换成字符串

#result =datetostr (today)

Li.append (Datetostr (today))

Return Li

#将字符串转换成datetime类型

def strtodatetime (Datestr,format):

Return Datetime.datetime.strptime (Datestr,format)

#时间转换成字符串, formatted as 2008-08-02

def datetostr (date):

return str (date) [0:10]

#两个日期相隔多少天, 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

#获取两个时间段的所有时间, return to 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

#获取当前年份 is a string

Def getYear ():

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

#获取当前月份 is a string

Def getMonth ():

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

#获取当前天 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 (' 2008-10-01 ', ' 2008-10-05 ')

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

Print str (getYear ()) +getmonth () +getday ()

Print Getnow ()

Python Time processing