The calendar of the Hobbits is very close to the King's Reckoning. Every month had 30 days, with five extra days which were their holiday. It was different from that used by the Men, Dwarves and Elves. The use of this calendar in Middle-earth is referred to as Shire-reckoning. Year 1 of the Shire Calendar corresponded when the Shire was founded by the Bree Hobbits Marcho and Blanco in the year 1601 of the Third Age. Therefore, years of the Third Age can be converted to Shire-years by subtracting 1600. The last year of the Third Age was year 1421 on the Shire calendar.