Migrate away from Moment.js

[mgwalker]

Currently, Charlie uses Moment.js for all date, time, and timezone-based functionality because honestly, who wants to code all that stuff from scratch? No thanks. However, Moment.js is being retired, eventually in favor of the upcoming Temporal global object. In the interim, the Moment.js team has some recommendations for replacements.

• investigate alternatives
• pick one
• decide when to make the switch (i.e., do we wait for Temporal? Find a reasonable polyfill? etc.)
• do the switching of the thing

[mgwalker]

I recommend holding on this one. Since Moment continues to work for us, and Temporal is (maybe!) close enough not to warrant an intermediary.

[mgwalker]

Temporal is still probably on track for ratification this summer. It would then need to be released in V8 and that V8 update would need to be picked up by Node.js. The V8 team is already working on it, but I wouldn't expect it to land in Node.js before v20 in fall of 2023.

It might be worth finishing up #321 and merging that. Relying on the polyfill isn't the worst thing we could do, and switching to native support when it becomes available ought to be pretty trivial (just take out the polyfill!).

[mgwalker]

lol Temporal