" April 5th. You know what that means to me? That means the budget for the project expired at the end of financial year 1968 and was not renewed. (Yes, British government budgets—and the tax year—start on April 6th. Why are you looking at me like that? Don’t your tax years start and stop on a random date in April?) I "

― Charles Stross , The Rhesus Chart (Laundry Files, #5)