Calculate Days Between Dates
Calculate days between dates, count weekdays, and determine business days between any two dates. Get total days, weekdays, and business days for project planning, deadlines, vacations, and date calculations.
Days Between Dates Calculator
November 8, 2025
November 15, 2025
Calculation Options
Toggle these options to control whether the start and/or end dates are included in the day count calculation.
Why Use Our Days Calculator?
100% Private
All calculations happen in your browser. We never see or store your dates.
Accurate & Reliable
Handles leap years, timezones, and all edge cases correctly.
Free Forever
No registration, no fees, no limits. Use it as much as you need.
Easy to Use
Simple interface that works on desktop, tablet, and mobile devices.
Common Use Cases
- ✓Countdown to deadlines, vacations, or special events
- ✓Calculate project duration for planning and billing
- ✓Determine time elapsed between historical dates
- ✓Plan milestones and track progress
- ✓Calculate contract or subscription periods
How It Works
Our calculator uses straightforward date mathematics to calculate the difference between two dates accurately. All calculations happen directly in your browser for instant results and complete privacy.
1. Date Normalization
Both dates are normalized to midnight to avoid timezone complications and ensure consistent results.
2. Timestamp Calculation
Each date is converted to a timestamp, and the difference is calculated in milliseconds.
3. Day Conversion
The millisecond difference is converted to days, accounting for leap years and month lengths.
4. Result Display
The result is displayed in a human-readable format, including total days and weekdays.
Privacy First: All calculations happen in your browser. Your dates never leave your device, and nothing is stored or transmitted to any server.
Frequently Asked Questions
How accurate is the calculator?
Our calculator is 100% accurate. It correctly handles leap years, different month lengths, year boundaries, and all edge cases. We use JavaScript's native Date object which follows the Gregorian calendar standard.
Is my data private?
Yes! All calculations happen entirely in your browser. We never see, store, or transmit your dates. Your privacy is our top priority—no registration, no tracking, no data collection.
What's the difference between total days and weekdays?
Total days includes all days between the two dates (including weekends). Weekdays only counts Monday through Friday, excluding weekends. This is useful for business days calculations.
What does "Include start date" and "Include end date" mean?
These options let you control whether the start and end dates are counted in the calculation. For example, if you want to know how many days until a deadline, you might exclude the end date. If you're calculating a period that includes both dates, include both.
Can I calculate dates in the past?
Absolutely! You can calculate the difference between any two dates, whether they're in the past, present, or future. The calculator works with dates from any year.
Does it work offline?
Yes! Once the page loads, all calculations happen in your browser using JavaScript. You don't need an internet connection to use the calculator after the initial page load.
Is this calculator free?
Yes, completely free! No registration, no fees, no limits. Use it as much as you need, whenever you need it.
Can I use this on mobile devices?
Yes! Our calculator is fully responsive and works perfectly on desktop, tablet, and mobile devices. The interface adapts to your screen size for the best experience.