Which special date, I am talking about?

Question

We know that a date is mostly written in two formats
i.e x.y or x/y
example: 4th November is written as 4.11 or 4/11.

But do you know there is a special date when product of these two date format is equal to 1
i.e x.y X x/y = 1

Which special date, I am talking about?

Answer 1

2nd February --> 2.5 or 2/5
2.5 x 2/5=1