[Issue 10828] datetime toString functions should accept sink

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=10828

--- Comment #5 from Jonathan M Davis <jmdavisProg at gmx.com> ---
> @jmdavis: Are you still working on the re-packaging of datetime? What's the status on that?

Enough has changed that I'm going to have to redo it, and I'm short on time
these days. It's currently my plan to make a series of smaller pull requests to
clean up the code further prior to splitting the module so that I don't have to
do as much cleanup when splitting it.

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