How to Check if a Date is a Business Day in Any Country (With Code Examples)

Building an app that handles scheduling, invoicing, or delivery estimates? You'll need to know if a given date is a business day - and that's trickier than it sounds when you're dealing with multiple countries. The Problem A "business day" isn't universal: Weekends vary : Saturday-Sunday in most countries, Friday-Saturday in UAE/Israel Public holidays differ : France has 11, Japan has 16, the US has 11 federal holidays Regional holidays exist : Bavaria (Germany) has holidays that don't apply in