subtractBusinessDays

Signature

subtractBusinessDays(value: string, amount: number): string

import { subtractBusinessDays } from "@northguild/gmt/plain/calculate";

Return a PlainDate ISO string with amount business days subtracted from value.

• Uses fixed ISO Monday–Friday business days (no locale awareness).
• Saturday and Sunday are skipped during the count.
• Negative amount behaves identically to addBusinessDays(value, Math.abs(amount)).
• Returns “” on invalid input.

Parameters

Parameter	Type	Description
value	string	ISO PlainDate string
amount	number	number of business days to subtract

Returns

ISO PlainDate string after subtracting business days, or “” on invalid input

Examples

subtractBusinessDays("2024-03-18", 1) // "2024-03-15"
subtractBusinessDays("2024-03-17", 1) // "2024-03-15"
subtractBusinessDays("2024-03-18", 0) // "2024-03-18"
subtractBusinessDays("invalid", 1) // ""

Source

plain/calculate/subtractBusinessDays.ts