[chore] manually parse dates

[chewnoill]

This should resolve #281

Javascript's Date.parse was returning inconsistent values depending on the string format, switching to moment avoids this problem. No other changes should be required. Pikaday will use moment by default if it is available.

This does add quite a bit to the js bundle size though.

Alternatively, we could just use a different date format #293

[chewnoill]

Interesting looks like a problem with javascripts Date.parse. Adding moment will fix the problem, because pikaday will use the moment date parser instead

js	evaluated (chrome)
new Date("2022/01/11")	Tue Jan 11 2022 00:00:00 GMT-0500 (Eastern Standard Time)
new Date("2022-01-11")	Mon Jan 10 2022 19:00:00 GMT-0500 (Eastern Standard Time)

[cpjolicoeur]

If we are going down the road of adding a dependency, I think I'd rather use something like dayjs or date-fns instead of moment to help reduce size. We can use the parse option of Pikaday to pass in the date parsing function we want to use.

Thoughts?

[chewnoill]

I like that waaaay better 👍

[cpjolicoeur]

@chewnoill I'm going to merge this into v4 but can you also open these same changes against master so that we can push a v3 release with this fix so that we can close out #281?