---
title: "Free Date Calculators and Countdown Tools | CalendarBest"
description: "Free date tools: add or subtract days from a date, count the days between dates, count down to Christmas or any day, and find today's ISO week number."
canonical_url: "https://calendarbest.com/tools"
locale: en
meta:
  "og:description": "Free date tools: add or subtract days from a date, count the days between dates, count down to Christmas or any day, and find today's ISO week number."
  "og:image": "https://calendarbest.com/og-image.png"
  "og:title": "Free Date Calculators and Countdown Tools | CalendarBest"
  "twitter:description": "Free date tools: add or subtract days from a date, count the days between dates, count down to Christmas or any day, and find today's ISO week number."
  "twitter:image": "https://calendarbest.com/og-image.png"
  "twitter:title": "Free Date Calculators and Countdown Tools | CalendarBest"
---

> Index of every page on this site: [llms.txt](https://calendarbest.com/llms.txt)

[<h2>**Date Calculator**</h2>Add or subtract days, weeks, months, years or business days from any date.](https://calendarbest.com/tools/date-calculator) [<h2>**Days Between Dates**</h2>Count the calendar days, weekdays and US working days between two dates.](https://calendarbest.com/tools/days-between-dates) [<h2>**Day Counter**</h2>Count the days since or until any date, and find day 100, 500 or 1,000.](https://calendarbest.com/tools/day-counter) [<h2>**Days Until**</h2>Count down the days until Christmas, New Year, a birthday or any date.](https://calendarbest.com/tools/days-until) [<h2>**Week Number**</h2>Find the ISO week number for any date, with the Monday–Sunday range.](https://calendarbest.com/tools/week-number)

## **Holiday countdowns**

[**Days until Christmas**](https://calendarbest.com/tools/days-until/christmas) [** Days until New Year's Day**](https://calendarbest.com/tools/days-until/new-year) [** Days until Halloween**](https://calendarbest.com/tools/days-until/halloween) [** Days until Thanksgiving**](https://calendarbest.com/tools/days-until/thanksgiving) [** Days until Valentine's Day**](https://calendarbest.com/tools/days-until/valentines-day)

## **Date Tools FAQ**

### **Are the date tools free?**

Yes. Every tool is free, needs no account and runs in your browser. Nothing you enter is sent to or stored on a server.

### **Which time zone do the tools use?**

Anything that depends on today, such as countdowns and the current week number, uses the date on your own device. Calculations between two dates count calendar days, so time zones and daylight saving time do not change the result.

### **Which holidays count as non-working days?**

Working and business days skip Saturdays, Sundays and the 11 US federal holidays on their observed dates. Holiday lists for other countries are on the holidays pages.

## **Put your dates on a calendar**

Add deadlines, countdowns and events in the builder and export a printable PDF.

[Open the Calendar Builder](https://calendarbest.com/builder)

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## Sitemap

See the full [sitemap](https://calendarbest.com/sitemap.md) for all pages.