isZonedBusinessDay

Signature

isZonedBusinessDay(value: string): boolean

Return true when value falls on a Monday–Friday ISO business day in the given timezone.

• Uses the fixed ISO Monday–Friday business-day boundary (Mon=1 … Fri=5), matching the definition used by addZonedBusinessDays/subtractZonedBusinessDays.
• Locale-agnostic: no Intl.Locale lookup and no holiday calendar.
• Returns false if value is invalid.
• Resolves the local day in the value’s own timezone, so a UTC instant that is Friday evening may be Saturday morning in Asia/Tokyo and thus not a business day there.
• Has no calendar parameter: the weekend is always Saturday–Sunday. It is not the zoned form of the plain isBusinessDay, which takes a BusinessCalendar (weekend days, holidays). For a Friday–Saturday weekend or holidays, convert to a plain date and call isBusinessDay with a calendar.

Parameters

Parameter	Type	Description
value	string	ISO 8601 zoned datetime string

Returns

true if value is a Monday–Friday business day, false on invalid input

Examples

import { isZonedBusinessDay } from "@northguild/gmt/zoned/compare";

isZonedBusinessDay("2024-02-05T10:00:00-05:00[America/New_York]") // true (Monday)

value

output

 

Source

zoned/compare/isZonedBusinessDay.ts