Python datetime module Basic usage

Import datetime, Calendar

Date = Datetime.datetime.now () Gets the current system time

#1, return to yesterday's date

Def getyesterday ():

Today=datetime.date.today ()

Oneday=datetime.timedelta (Days=1)

Yesterday=today-oneday

return yesterday

#2, return to today's date

Def gettoday ():

Return Datetime.date.today ()

#3, gets the date of the previous day of the given argument, 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

#4, converting a string to a datetime type

def strtodatetime (Datestr,format):

Return Datetime.datetime.strptime (Datestr,format)

#5, time converted to string, formatted as 2008-08-02

def datetostr (date):

return str (date) [0:10]

#6, two days apart, 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

#7, gets all the time of two time periods, returns a 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

#8, gets the current year is a string

Def getYear ():

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

#9, gets the current month is a string

Def getMonth ():

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

#10, gets 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 (' 2008-10-01 ', ' 2008-10-05 ')

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

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

Print Getnow ()

Python datetime module Basic usage