Working Calendar is a business-day calculator that counts Monday to Friday working days between two dates, excluding holidays from the calendar you choose. You can add or subtract business days, count from today, and include or exclude the start and end dates. Calendars cover US Federal, England and Wales, Scotland, and Northern Ireland.
Month-by-month annual calendars for 2026 to 2028 come with a data sources page. It is a website only, and the calculator needs JavaScript. US Federal counts do not reflect bank, ACH, Federal Reserve or securities exchange schedules. Not affiliated with OPM or GOV.UK.
Simple date subtraction does not account for weekends and regional holidays. Working Calendar makes those assumptions visible and lets people check a working-day count before planning a timeline.