# -*- coding: utf- -*-

 '''获取当前日期前后N天或N月的日期'''

 from time import strftime, localtime

 from datetime import timedelta, date

 import calendar

 year = strftime("%Y",localtime())

 mon  = strftime("%m",localtime())

 day  = strftime("%d",localtime())

 hour = strftime("%H",localtime())

 min  = strftime("%M",localtime())

 sec  = strftime("%S",localtime())

 def today():

     '''''

     get today,date format="YYYY-MM-DD"

     '''''

     return date.today()

 def todaystr():

     '''

     get date string, date format="YYYYMMDD"

     '''

     return year+mon+day

 def datetime():

     '''''

     get datetime,format="YYYY-MM-DD HH:MM:SS"

     '''

     return strftime("%Y-%m-%d %H:%M:%S",localtime())

 def datetimestr():

     '''''

     get datetime string

     date format="YYYYMMDDHHMMSS"

     '''

     return year+mon+day+hour+min+sec

 def get_day_of_day(n=):

     '''''

     if n>=,date is larger than today

     if n<,date is less than today

     date format = "YYYY-MM-DD"

     '''

     if(n<):

         n = abs(n)

         return date.today()-timedelta(days=n)

     else:

         return date.today()+timedelta(days=n)

 def get_days_of_month(year,mon):

     '''''

     get days of month

     '''

     return calendar.monthrange(year, mon)[] 

 def get_firstday_of_month(year,mon):

     '''''

     get the first day of month

     date format = "YYYY-MM-DD"

     '''

     days=""

     if(int(mon)<):

         mon = ""+str(int(mon))

     arr = (year,mon,days)

     return "-".join("%s" %i for i in arr) 

 def get_lastday_of_month(year,mon):

     '''''

     get the last day of month

     date format = "YYYY-MM-DD"

     '''

     days=calendar.monthrange(year, mon)[]

     mon = addzero(mon)

     arr = (year,mon,days)

     return "-".join("%s" %i for i in arr) 

 def get_firstday_month(n=):

     '''''

     get the first day of month from today

     n is how many months

     '''

     (y,m,d) = getyearandmonth(n)

     d = ""

     arr = (y,m,d)

     return "-".join("%s" %i for i in arr) 

 def get_lastday_month(n=):

     '''''

     get the last day of month from today

     n is how many months

     '''

     return "-".join("%s" %i for i in getyearandmonth(n)) 

 def getyearandmonth(n=):

     '''''

     get the year,month,days from today

     befor or after n months

     '''

     thisyear = int(year)

     thismon = int(mon)

     totalmon = thismon+n

     if(n>=):

         if(totalmon<=):

             days = str(get_days_of_month(thisyear,totalmon))

             totalmon = addzero(totalmon)

             return (year,totalmon,days)

         else:

             i = totalmon/

             j = totalmon%

             if(j==):

                 i-=

                 j=

             thisyear += i

             days = str(get_days_of_month(thisyear,j))

             j = addzero(j)

             return (str(thisyear),str(j),days)

     else:

         if((totalmon>) and (totalmon<)):

             days = str(get_days_of_month(thisyear,totalmon))

             totalmon = addzero(totalmon)

             return (year,totalmon,days)

         else:

             i = totalmon/

             j = totalmon%

             if(j==):

                 i-=

                 j=

             thisyear +=i

             days = str(get_days_of_month(thisyear,j))

             j = addzero(j)

             return (str(thisyear),str(j),days) 

 def addzero(n):

     '''''

     add  before -

     return -

     '''

     nabs = abs(int(n))

     if(nabs<):

         return ""+str(nabs)

     else:

         return nabs 

 def get_today_month(n=):

     '''''

     获取当前日期前后N月的日期

     if n>, 获取当前日期前N月的日期

     if n<, 获取当前日期后N月的日期

     date format = "YYYY-MM-DD"

     '''

     (y,m,d) = getyearandmonth(n)

     arr=(y,m,d)

     if(int(day)<int(d)):

         arr = (y,m,day)

     return "-".join("%s" %i for i in arr) 

 if __name__=="__main__":

     print today()

     print todaystr()

     print datetime()

     print datetimestr()

     print get_day_of_day()

     print get_day_of_day(-)

     print get_today_month(-)

     print get_today_month()