Or was it 31/12? 03/01? 06/30? 11/11? Choose whichever fits you best, just try to come up with a nice supportive story. Of course, you can just throw in another date like some, as it has happened for most of the times over the last years.
But be honest, it`s way more fun if there is a story covering for it, even so you need to find a new one each time, as of course, your date will come an go as a non-event.
Like 100% of the dates set so far. Come one, use your noodle! Know what you don`t won! The date is the tell!