import * as mod from "https://dotland.deno.dev/std@0.192.0/datetime/is_leap.ts"; FunctionsfisLeapReturns whether the given date or year (in number) is a leap year or not in the local time zone. based on: https://docs.microsoft.com/en-us/office/troubleshoot/excel/determine-a-leap-year fisUtcLeapReturns whether the given date or year (in number) is a leap year or not in UTC time. This always returns the same value regardless of the local timezone. based on: https://docs.microsoft.com/en-us/office/troubleshoot/excel/determine-a-leap-year