The $1 Ice Cream promotion is available only on Tuesday 7th , 14th, 21st, 28th November 2017 from 0h until 23.59h or during shop opening hours. Offer is valid for one single scoop ice cream or cream freeze and excludes any other Night 'n Day product. Limit one per person. While stocks last. Valid in participating stores only. Offer not available in conjunction with any other promotion. Manager's discretion applies.
See link for T&Cs.
I changed the dates as the ones on their website is from last years. Hoping they'll correct that soon. They've updated. That was quick.