New Reckoning

Aragorn the King Elessar's New Reckoning was the calendar system introduced in Gondor shortly after the War of the Ring and intended to replace the Stewards' Reckoning. It became the common calendar of the Reunited Kingdom during the Fourth Age, except in The Shire where the use of the Shire Calendar continued.

The chief feature of the New Reckoning calendar was that the year began on the anniversary of the destruction of the One Ring.

Its other notable feature was that the birthday of Frodo Baggins, 30 Yavannië in the New Reckoning which corresponded with 22 Halimath in the Shire Calendar, was made a festival in honor of the Ring-bearer. In leap-years 30 Yavannië corresponded with 21 Halimath in the Shire Calendar (due to its Overlithe leap-day at midsummer), so the New Reckoning leap-day was inserted between Yavannië and the Enderi, and Frodo's birthday feast, called Cormarë or "Ringday", was doubled in leap-years.