📖 How to Use This Day Calculator
This free day calculator offers four tools in one page — designed for anyone who needs to count days, plan schedules, or track important dates. No signup required, works instantly.
1️⃣
Business Days Calculator
Count working days (Monday–Friday) between any two dates. Perfect for project planning, shipping estimates, or calculating business days without weekends.
2️⃣
Date Difference Calculator
Get the exact number of calendar days between two dates. Useful for age calculation, rental periods, or any scenario where you need the total day gap.
3️⃣
Countdown Timer
See exactly how many days, hours, minutes, and seconds until (or since) any date. Great for countdown to Christmas, birthdays, vacations, or deadlines.
Plus, the US Holidays 2026 section shows all federal holidays at a glance — handy for scheduling around days when businesses and banks are closed.
❓ Frequently Asked Questions
What is a Business Day?
A business day is any day from Monday to Friday, excluding weekends (Saturday and Sunday). Our calculator automatically excludes weekends when counting business days.
How is the Date Difference calculated?
Date difference is calculated as the absolute number of calendar days between the start and end dates, inclusive of the start date. For example, Jan 1 to Jan 3 is 3 days.
How does the Countdown Timer work?
Select a target date, optionally name the event (e.g., "My Birthday"), and click Start Countdown. The timer updates every second and shows days, hours, minutes, and seconds remaining.
Are US Holidays included in Business Days?
No. The Business Days calculator only excludes weekends (Sat/Sun). US federal holidays are shown separately for reference but are NOT automatically excluded from the business day count.
Can I use this tool on mobile?
Yes! This tool is fully responsive and works on all devices — mobile, tablet, and desktop. No app download needed.
Does the Countdown work for past dates?
Yes. If the target date is in the past, the countdown will show how many days have passed since that date, so you can use it as a "days since" calculator too!
Is my data saved or sent to a server?
No. All calculations happen entirely in your browser. No data is saved or sent anywhere. Your privacy is fully protected.
How do I calculate how many days until a specific date?
Use the Countdown Timer. Pick your target date (e.g., Christmas, a birthday, or a deadline), click Start Countdown, and see exactly how many days, hours, minutes, and seconds remain. Works with or without an event name.
Can I calculate date difference excluding weekends?
Yes! Use the Business Days Calculator (not Date Difference) for that. The Date Difference tool counts all calendar days, while Business Days Calculator only counts Monday-Friday. Both are available on this page.
How many business days are in a month?
Most months have 20-23 business days. February has 20, while 31-day months can have up to 23. Use our Business Days Calculator to check any specific month — just enter the 1st and last day of the month.