Cheers all for the very insightful responses.

I put '1992' in the year section as the date when I last visited the US. I left the day/month sections blank and will probably come up with the Disneyland recollection when questioned. Was only 6 then...gosh its been a long time.

Will update y'all when I get everything done including the interview, which will probably be sometime in August as I do not want my passport to be stuck in the consular when I have confirmed travel plans in June and July.

Thanks once again for being so helpful.