Date Calculator — Calculate Days, Business Days & More
Calculate the difference between two dates. Count total days, business days, and weekends. Create countdown timers for upcoming events. Browser-based.
Features
- ✓Calculate total days between two dates
- ✓Count business days (excluding weekends)
- ✓Count weekend days (Saturday and Sunday)
- ✓Show breakdown in weeks and remaining days
- ✓Create countdown timer for future events
- ✓Support for past and future dates
- ✓Instant calculation as you select dates
- ✓Perfect for project planning and deadlines
- ✓Useful for vacation and leave planning
- ✓All calculations run locally in your browser
How to Use
- 1Select the start date using the date picker.
- 2Select the end date using the date picker.
- 3View total days, business days, and weekends.
- 4See the breakdown in weeks and days.
- 5For countdown, select a future date.
- 6Watch the live countdown timer update.
- 7Calculate project milestones — select start date and end date to find out exactly how many business days you have to complete the work.
- 8Plan vacation days — pick your start and end dates to see total days including a breakdown of workdays vs weekends.
- 9Check how many weeks until a deadline — the tool shows weeks + remaining days, helping you pace long-term projects.
- 10Use the live countdown for product launch dates, birthdays, anniversaries, or any upcoming event — watch the seconds tick down in real time.
Frequently Asked Questions
How are business days calculated?
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Business days are Monday through Friday, excluding Saturday and Sunday. The calculator counts each weekday between the start and end dates. This is useful for project planning, SLA calculations, and work schedules.
Does it include the start and end dates?
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Yes, both the start and end dates are included in the count. For example, from June 1 to June 3 counts as 3 days (June 1, 2, and 3). This follows standard date range conventions.
Does it account for holidays?
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No, the calculator only excludes weekends (Saturday and Sunday). Public holidays are not automatically excluded because they vary by country and region. For accurate business day counts, manually subtract known holidays from the result.
How does the countdown timer work?
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The countdown shows the time remaining until the target date from the current moment. It displays days, hours, minutes, and seconds, and updates in real-time. Use it for event planning, deadlines, or special occasions.
Can I calculate dates in the past?
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Yes. The calculator works with any dates, past or future. For past dates, it shows the duration between those dates. The countdown timer shows 0 for past dates since the event has already occurred.
Is my date data sent to a server?
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No. All calculations happen entirely in your browser using JavaScript. Your dates and results are never transmitted over the network. The tool works offline after the page loads.
How do I calculate a future date from today?
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Select today's date as the start date, then select your target end date. The tool shows the duration between them. For countdown, any future date automatically triggers the live countdown timer showing days, hours, minutes, and seconds remaining.
How many weeks are in a year?
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A standard year has 52 weeks + 1 day (or 52 weeks + 2 days in a leap year). That's 365 or 366 days. The tool shows your date range in weeks and remaining days — select January 1 to December 31 to see the exact weekly breakdown of any year.
What is the Julian day number?
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The Julian day number is a continuous count of days since January 1, 4713 BC (Julian calendar). It's used in astronomy for calculating time intervals. This tool uses the standard Gregorian calendar, which is the civil calendar used worldwide today.
How do I calculate age from a birthdate?
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Select the birth date as start and today's date as end. The tool shows total days, which you can divide by 365.25 for approximate years. For example, 10,000 days ≈ 27.4 years. For precise age calculation, use a dedicated age calculator tool.
How does the tool handle leap years?
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The tool correctly handles leap years (February 29) in all calculations. Leap years are divisible by 4, except century years not divisible by 400. 2024 is a leap year, 2100 is not. Business day and weekend counts automatically adjust for leap year February dates.
Can I calculate deadlines with business days?
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Yes. The business day count shows exactly how many weekdays (Mon-Fri) are between any two dates. This is essential for SLA agreements, contract deadlines, legal filing periods, and project management timelines. Remember to manually subtract any public holidays.
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