Writing a helper that produces bound results?

Question

I have a date/time formatting helper but what it produces does not update when the underlying property changes. This is not a surprise, but does anyone know how to produce

Answer 1

It is unfortunately more complex than I'd like to create a custom helper with bound content. Here's an example that Peter Wagenet wrote: https://gist.github.com/1563710

I'll be lobbying for this to become easier.