These are said to be promotional calendars, but I'm not sure where they are being given out.
It'd be nice if they were given out with the toys, and since it has two months on each, they could release enough GT-R toys to cover all of the months in the year. The first ones get released in March, but the months on these first two "calendars" are June/July & August/September.
These are the first two for the first two GT-R bots (and girls).