Text tools for game scheduling

1. A way to create a count-down timer in text that is universal to everyone who sees it. The simplest is to have some kind of special text field or format that is translated to your local time zone. More complicated is to allow for a count-down that shows an active ticking countdown. As a random off-the-cuff example, :time=12:00:00+2uct: or something similar.

2. Just a calendar or whatever. A day calendar where people can plop down when they're free.