++

Most of the time, I find myself coming back to this module because it’s an abstract data type.   An instance of the object, once loaded with a particular date by whatever means, “is an” instance of that date.   It is completely opaque and it just does the right thing.   Since you often find yourself doing a series of not-quite trivial things with date/time values, this is a great tool.

I peeked at the source code once.   Wow.   “Glad somebody wrote that (and wrote it so well) ... glad it wasn’t me.”