The Imperial year is 365 days long. It is divided into 12 months of 3 tendays each, plus five intercalary days.
Years are dated from the founding of the Empire, where AD 2153 = TE 0.
Year Day (intercalary)
Walpurgis (intercalary)
Armstrong Day (intercalary)
Empire Day (intercalary)
Yulestice (intercalary)