Date Calculator: Days Between Dates & Countdown Timer
Date calculator online: find days between two dates, count business days and weekends, and run a live countdown timer for upcoming events.
Updated 2026-08-16
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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
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?
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?
Yes, this date calculator includes both the start and end dates 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?
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?
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?
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.
Can the date calculator add days to a date?
Not directly: this calculator measures the duration between two dates; it has no 'date + N days' arithmetic mode. To find the date that is N days away, use a spreadsheet (A1+30 in Excel) or pick candidate dates here and check the day count. Business-day mode helps when the N days must exclude weekends.
Does it work with the Nepali calendar (Bikram Sambat)?
No, all calculations use the Gregorian calendar. The Nepali Bikram Sambat calendar is about 56.7 years ahead of the Gregorian calendar, so convert a BS date to its AD equivalent with a calendar conversion tool first, then use the converted dates here.
How do I calculate a future date from today?
Select today's date as the start date, then select your target end date: this date calculator shows the days between two dates. 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?
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?
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?
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?
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?
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.
Why is my calculation off by one day?
Two conventions cause most one-day differences. First, inclusivity: some tools count both the start and end date, others count only complete days in between; this tool uses the exclusive convention (e.g., Jan 1 to Jan 2 is 1 day), which is the standard for duration math. Second, time zones: dates are interpreted in your local time zone, so a calculation made near midnight UTC can differ by one day from a UTC-based calculator. If a third-party result differs, check which convention and time zone it uses.
Can I get the difference in months or years, not just days?
The output is in days (plus a weeks breakdown), not months: a month count depends on the starting day, since February 15 to March 15 is one month but 28 or 29 days depending on the year. For month-based differences use Excel's DATEDIF(start, end, "m"), or read the day count here and divide by 30.4 as a rough monthly figure. For precise age in years, use the site's dedicated age calculator.
Why does my countdown look wrong for an event in another time zone?
The countdown computes against your local time zone, so an event published in UTC or in another country will show a different remaining time unless you convert the target time first. When an announcement states a timezone (for example 10:00 UTC), convert that to your local time and set the date accordingly, or set the given time and apply the offset manually. The same applies to global product launches and webinars.