TAG Heuer offer the combination Day-Date feature on several Calibre 16 watches, (The Aquaracer and- in the past- the Link) but typically the only change between the two versions is the larger date window and additional functionality implied by the name. As someone who rarely uses the date function and never uses the day function (sure, I forget the date occasionally, but rarely which day of the week it is), it’s not the functionality of this watch that makes it interesting to me- it’s the design.