Hong Kong Airport Express Card

Hello,

We arrive at 17.15 on the 1st August and will travel straight to our Hotel and will not travel again that day, will this count as the 1st Day of our pass meaning we can only use it for day 2 and 3 of our stay in HK, we do not actually leave until the evening of the 6th August so unsure if this is the best card to purchase.
Many thanks.