timeanddate.com Business Days Calculator vs BusinessDayCalculator.org
Last reviewed: May 19, 2026
timeanddate.com is one of the oldest and most trusted date and time references on the web. Its Business Days Calculator counts workdays between two dates, and its Business Date Calculator adds or subtracts workdays from a start date, both with public holidays available for more than 200 countries and regions. If you simply need an accurate workday count for almost any country, it is an excellent choice and this page will not pretend otherwise.
The two sites aim at slightly different jobs. timeanddate is a broad reference covering time zones, durations, calendars, and holidays worldwide. BusinessDayCalculator.org is narrower and built around billing and deadline work: payment terms, invoice due dates, and service-level windows. The comparison below lays out where each one is the better pick.
Where timeanddate.com wins
Country breadth is the clear one. With holidays for 200+ countries and regions, timeanddate covers places this site does not, and it pairs the calculation with a deep library of time-zone and calendar tools. For a quick workday count in, say, a country outside the 25 covered here, open timeanddate and you are done.
Where this calculator wins
Billing context. Instead of a single general add-and-subtract tool, there are dedicated calculators for Net 30, Net 60, Net 90, invoice due dates, and SLA response windows, each with the relevant copy and FAQs. Results are encoded in the URL, so a link reproduces the exact calculation for whoever you send it to. The interface is available in English, German, and Spanish. And every calculator can be dropped into your own site as a free embeddable widget, which suits help centres and finance teams that want the tool inside their own pages.
| Feature | timeanddate.com | BusinessDayCalculator.org |
|---|---|---|
| Cost / account | Free, no account, ad-supported | Free, no account or sign-up |
| Public holiday coverage | 200+ countries and regions | 25 countries plus sub-national regions |
| Count business days between dates | Yes, Business Days Calculator | Yes, built in |
| Add or subtract business days | Yes, Business Date Calculator | Yes, built in |
| Custom weekend (Fri-Sat, Sun-Thu) | Yes, choose which weekdays count in the result | Yes, set automatically per country |
| Payment-term presets (Net 30/60/90, invoice, SLA) | No presets, general date math only | Dedicated Net 30/60/90, invoice due date, and SLA calculators |
| Embed on your own site | Centered on timeanddate.com's own pages | Yes, free iframe widgets |
| Interface languages | English | English, German, Spanish |
Best fit here: deadline and billing math
Start with the business days between dates calculator for a plain count, or jump straight to a Net 30, invoice due date, or SLA deadline calculation. Want it inside your own site? Grab a free embed widget. More side-by-sides on the alternatives hub.