Business days between dates

Count Monday-to-Friday weekdays between two selected dates.

Your inputs stay in your browser.

Method and assumptions

Method version 1.0.0 · Updated October 2, 2026

Count business days

Formula: Weekdays from the day after the start date through the end date, inclusive

Example: Monday to Friday in the same week = 4 business days under this convention.

start: Start date
end: End date

The start date is excluded and the end date included. Only Saturdays and Sundays are excluded. Public holidays and country-specific calendars are not included. A negative result means the dates were entered in reverse order.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript

const start = new Date(Date.UTC(2026, 0, 5));
let weekdays = 0;
for (let d = new Date(start); d < new Date(Date.UTC(2026, 0, 12)); d.setUTCDate(d.getUTCDate() + 1)) if (d.getUTCDay() % 6) weekdays++;
console.log(weekdays); // 5 (holidays excluded separately)

TypeScript

const start = new Date(Date.UTC(2026, 0, 5));
let weekdays = 0;
for (let d = new Date(start); d < new Date(Date.UTC(2026, 0, 12)); d.setUTCDate(d.getUTCDate() + 1)) if (d.getUTCDay() % 6) weekdays++;
console.log(weekdays); // 5

Python

from datetime import date
from numpy import busday_count
print(busday_count(date(2026, 1, 5), date(2026, 1, 12)))  # 5 weekdays

Java

var start = java.time.LocalDate.of(2026, 1, 5);
var end = java.time.LocalDate.of(2026, 1, 12);
long count = start.datesUntil(end).filter(d -> d.getDayOfWeek().getValue() < 6).count();
System.out.println(count); // 5

var start = new DateOnly(2026, 1, 5);
var end = new DateOnly(2026, 1, 12);
int count = Enumerable.Range(0, end.DayNumber - start.DayNumber).Count(i => start.AddDays(i).DayOfWeek is not (DayOfWeek.Saturday or DayOfWeek.Sunday));
Console.WriteLine(count); // 5