Update fields in first_record_start_date

app/services/bulk_upload/sales/year2024/csv_parser.rb

@@ -80,6 +80,7 @@ private
   end
 
   def with_headers?
+    # we will eventually want to validate that headers exist for this year
     rows.map { |r| r[0] }.any? { |cell| cell&.match?(/field number/i) }
   end
 
@@ -100,9 +101,9 @@ private
 
   def first_record_start_date
     if with_headers?
-      Date.new(row_parsers.first.field_4.to_i + 2000, row_parsers.first.field_3.to_i, row_parsers.first.field_2.to_i)
+      Date.new(row_parsers.first.field_6.to_i + 2000, row_parsers.first.field_5.to_i, row_parsers.first.field_4.to_i)
     else
-      Date.new(rows.first[3].to_i + 2000, rows.first[2].to_i, rows.first[1].to_i)
+      Date.new(rows.first[5].to_i + 2000, rows.first[4].to_i, rows.first[3].to_i)
     end
   end
 end