Schaltjahr
The Tripura Era's New Year is on the 1st of Vaishak which corresponds to 14 or 15 of April of Common_Era, depending on whether that year is a Leap year or not. The months are named in pan Indian months, time since its inception 1419 years back by Tripur king Hamtorfa alias Himtifa alias Jujharufa in 512 Saka Era.