class DateUtilsimport { DateUtils } from "https://deno.land/x/datenp@0.1.2/mod.ts"; PropertiesprivateleapYearsCache: number[]privateyearsCache: number[]readonlyadMonthsreadonlyleapYearsreadonlymonthsreadonlynumbersreadonlyrawreadonlyweekDaysMethodsgetSeparator(str: string)getYear(year: string | number)validateYear(year: string | number)[Symbol.iterator]()