code: def check_valid_bs_range(date):
      
      ERR_MSG = "%s out of range" % str(date)
  
      if date.year < values.START_NP_YEAR or date.year > values.END_NP_YEAR:
          raise ValueError(ERR_MSG)
      if date.month < 1 or date.month > 12:
          raise ValueError(ERR_MSG)
      if date.day < 1 or date.day > values.NEPALI_MONTH_DAY_DATA[date.year][date.month - 1]:
          raise ValueError(ERR_MSG)
      return True
docs: Checks if the nepali date is in valid range for conversion