new_contents: def get_year_paramters(time=10) :
      import datetime as dt
      today = dt.datetime.today()
      d = dt.timedelta(days = ((time+1)*365))
      start_date = today -d
      return start_date.year, today.year, range(start_date.year,today.year)
  def getLastDay(month,year) :
      import datetime
      ret = datetime.date (year, month+1, 1) - datetime.timedelta (days = 1)
      return ret.day
  
subject: Create time-util.py