Anthony R. J. Ball wrote: > Are three even necessary? Not absolutely, but with two when you want to find the start of the current observance you'd have to use both methods and a date equality comparison. It'd be a pain, lots of people wouldn't bother doing it properly and you'd get code that fails if given a date that is exactly a boundary. The three method way puts the effort where it belongs: in the library, where it's actually easier to implement than the two methods.
-zefram
