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@burglekitt/gmt

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Temporal-based date and time utilities with timezone support and polyfill integration

github.com/burglekitt/gmt

burglekitt/gmt

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/** * Return true when `value` falls on a Monday–Friday ISO business day. * * - Uses the fixed ISO Monday–Friday business-day boundary (Mon=1 … Fri=5), * matching the definition used by `addBusinessDays`/`subtractBusinessDays`. * - Locale-agnostic: no `Intl.Locale` lookup and no holiday calendar. * - Returns false if `value` is invalid. * * This is the locale-agnostic complement to the locale-aware `isWeekend`: `isWeekend` * resolves weekend days per locale via `Intl.Locale.prototype.weekInfo`, whereas * `isBusinessDay` always treats Monday–Friday as business days regardless of locale. * * @param value ISO PlainDate string * @returns true if `value` is a Monday–Friday business day, false on invalid input * * @example isBusinessDay("2024-02-05") // true (Monday) * @example isBusinessDay("2024-02-10") // false (Saturday) * @example isBusinessDay("2024-02-04") // false (Sunday) * @example isBusinessDay("invalid") // false */ export declare function isBusinessDay(value: string): boolean;