if(
   (
      ($wrongDateFlag == 0)      #if the end date is correct
      && (
            (scalar @ARGV >= 3 && $oneDayFlag == -1)
                        #there are three or more arguments in a interval model
            || (scalar @ARGV >= 2 && $oneDayFlag >= 0)
                        #or there are two or more arguments in a one day model
         )
   )
   || ($wrongDateFlag == 1 && scalar @ARGV >= 3)#or if the end date is incorrect
                        #and there are three or more arguments
)