Date Calculator – Calculate Dates & Differences
Calculate date differences, add or subtract days/weeks/months/years, count business days excluding weekends, and countdown to any event. Accurate calculations for project planning, age calculation, and scheduling.
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Examples of Real-World Usage
10 real-world examples
Project Management
Calculate project durations, set realistic deadlines, track milestone dates, and estimate delivery times excluding weekends and holidays.
Age Calculation
Calculate exact age in years, months, and days for documents, forms, age verification, birthday planning, and milestone celebrations.
Event Planning
Count down to weddings, conferences, product launches, or any event. Calculate setup days, preparation time, and vendor schedules.
Legal & Contracts
Calculate contract expiration dates, notice periods, statute of limitations, payment due dates, and legal deadline compliance.
HR & Payroll
Calculate employee tenure, probation periods, notice periods, leave accruals, work anniversary dates, and retirement planning.
Travel Planning
Calculate trip durations, visa validity periods, passport expiration dates, travel insurance coverage, and itinerary planning.
Education & Academia
Calculate academic term lengths, assignment deadlines, exam preparation time, semester dates, and graduation countdowns.
Finance & Banking
Calculate loan terms, investment maturity dates, payment schedules, interest accrual periods, and financial planning timelines.
Healthcare
Calculate pregnancy due dates, medication schedules, treatment durations, appointment intervals, and recovery period tracking.
Real Estate
Calculate lease periods, rental agreements, escrow timelines, closing dates, notice to vacate periods, and property management schedules.
Powerful Date Calculation Features
Complete suite of date calculation tools including date difference calculator, add/subtract calculator, business days counter, and countdown timer. Perfect for project management, planning, and scheduling.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, weeks, days, hours, and minutes. Perfect for age calculation, project timelines, and event planning.
Business Days Counter
Automatically counts business days (Monday-Friday) and excludes weekends. Essential for project deadlines, delivery estimates, and work planning.
Add/Subtract Date Calculator
Add or subtract days, weeks, months, or years from any date. Quickly calculate future or past dates for planning and scheduling.
Days Until/Since Counter
Count days until a future event or days since a past event. Perfect for countdowns, anniversaries, and milestone tracking.
Multiple Date Formats
View dates in various formats including ISO, full text format with day names, and localized formats for different regions.
Weekend & Holiday Exclusion
Optionally exclude weekends when calculating business days. Essential for accurate work-related date calculations.
Quick Date Shortcuts
One-click buttons for common dates: today, yesterday, last week, last month. Speed up your date calculations.
Copy to Clipboard
Instantly copy calculated results to clipboard with a single click. Easy sharing and documentation of date calculations.
Real-time Calculations
All calculations update instantly as you change inputs. No need to click calculate buttons repeatedly.
Comprehensive Statistics
View total days, weeks, months, business days, and weekend days all at once. Get complete date analysis.
Mobile Responsive
Works perfectly on all devices - desktop, tablet, and mobile. Calculate dates on the go with touch-friendly interface.
No Installation Required
100% browser-based tool. No downloads, no sign-up, completely free. Works in any modern web browser.
How to Use
Simple 8-step process
Step 1
Select Calculator Type - Choose from four tabs: Date Difference (calculate between dates), Add/Subtract (modify dates), Business Days (work days), or Days Until (countdown/countup).
Step 2
Enter Your Dates - Click on date inputs to select dates using the calendar picker, or type dates directly in YYYY-MM-DD format.
Step 3
Configure Options - For business days calculator, toggle 'Exclude Weekends' to count only weekdays. For add/subtract, choose operation and unit.
Step 4
View Results - Results appear instantly showing years, months, days, business days, weekends, and more detailed breakdowns.
Step 5
Use Quick Actions - Click quick action buttons at the bottom for common dates: Today, Yesterday, Week Ago, Month Ago to speed up calculations.
Step 6
Copy Results - Click the 'Copy' button on any result card to copy the calculated date or difference to your clipboard for easy sharing.
Step 7
Switch Between Calculators - Use the tab buttons to switch between different calculation modes without losing your current inputs in other tabs.
Step 8
Check Date Formats - Below each date input, you'll see the date displayed in full text format with day of week for easy verification.
Frequently Asked Questions
Everything you need to know about our process, pricing, and technical capabilities.
See Full FAQThe date calculator is 100% accurate. It accounts for leap years, varying month lengths, and time zones correctly. All calculations use JavaScript's built-in Date object which follows international standards.
Yes! The calculator automatically accounts for leap years when calculating date differences and adding/subtracting dates. February 29th is correctly handled in leap years.
Business days are weekdays (Monday through Friday), excluding weekends (Saturday and Sunday). This calculator doesn't account for public holidays, only weekends.
Absolutely! The calculator works with any date range, whether it's a few days or hundreds of years. There are no limitations on date ranges.
Most businesses operate Monday-Friday, so business day calculations exclude weekends by default. You can toggle this option off in the Business Days calculator if you need to count all calendar days.
Yes! Use the Date Difference calculator. Enter birthdate as start date and today's date (or any date) as end date to get exact age in years, months, and days.
Use the Add/Subtract calculator tab. Choose 'Add', select your unit (days/weeks/months/years), enter the number, and the result will show your future date.
Total days counts every single day including weekends. Business days only counts weekdays (Monday-Friday), which is useful for work-related calculations.
Yes! Use the 'Days Until' tab. Enter your vacation date and it will show exactly how many days remain, plus weeks and months approximation.
Yes! Once the page is loaded, all calculations happen locally in your browser. No internet connection is needed for calculations.
Yes! All calculators work with both past and future dates. The 'Days Until' tab shows negative numbers for past dates (days since).
No data is saved or transmitted. All calculations happen entirely in your browser. Nothing is stored on servers or sent over the internet.
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