Well, this is certainly one way to keep track of time. A new calendar in Japan is shaped liked a schoolgirl uniform where the owner of the calendar determines what day and month it is by lifting up the skirt. 

The calendar features a silhouette of a waist-down woman wearing knee-high socks and platform shoes, and it comes in both dark blue and gray. The school uniform calendar will be available on Amazon later this month. 

I'm guessing that this calendar will be a pretty big hit although it's admittedly a bit tacky. I will say that it's a pretty clever way to get people intrigued about the day/month in the privacy of their own home. 

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