import { isLeap } from "https://dotland.deno.dev/std@0.224.0/datetime/mod.ts";
Returns whether the given year is a leap year. Passing in a
{@link Date
} object will return the leap year status of the year of that
object and take the current timezone into account. Passing in a number will
return the leap year status of that number.
This is based on https://docs.microsoft.com/en-us/office/troubleshoot/excel/determine-a-leap-year.