Python Time processing detailed

1. Two ways to get the current time:

Import Datetime,timenow = Time.strftime ("%y-%m-%d%h:%m:%s") Print Nownow = 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 runningendtime = 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, one day today=today-oneday #把日期转换成字符串 #result =da Tetostr (Today) Li.append (Datetostr (today)) return Li #将字符串转换成datetime类型 def strtodatetime (datestr,f         ormat): Return Datetime.datetime.strptime (Datestr,format) #时间转换成字符串 in the format 2008-08-02 def datetostr (date): return str (date) [0:10] #两个日期相隔多少天, for example: 2008-10-03 and 2008-10-01 are two days apart def DateDiff (begindate,enddate): forma        T= "%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, returns list D        EF 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 I N Range (0,num): Li.append (Datetostr (ed)) Ed=ed-oneday return Li #获取当前年份 is a string def getye AR (): Return str (Datetime.date.today ()) [0:4] #获取当前月份 is a string def getMonth (): Return str (datetime.date.tod  Ay ()) [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 ()

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