datetime/mod.ts: difference incorrect for 'quarters'

[sspilleman]

Describe the bug

difference results in incorrect value for 'quarters'

Steps to Reproduce

import { difference } from "https://deno.land/std@0.170.0/datetime/mod.ts";

const date0 = new Date("2018-05-14");
const date1 = new Date("2020-06-13");

console.log(difference(date0, date1));

The output is:

{
  milliseconds: 65750400000,
  seconds: 65750400,
  minutes: 1095840,
  hours: 18264,
  days: 761,
  weeks: 108,
  months: 24,
  quarters: 6,
  years: 2
}

Expected behavior

If the value for months is 24 the value for quarters should be 8 instead of 6.... right?

Environment

• OS: macOS Ventura 13.1 (22C65)
• deno version: 1.29.1 (release, aarch64-apple-darwin)
• std version: 0.170.0

[iuioiua]

I'll fix this in a PR this week.