Date Calculator
Calculate the difference between two dates, add or subtract time from any date, or find a specific date in the future or past. Perfect for project planning, event countdowns, age calculations, and more.
Calculate Days Between Dates
Find the exact difference between two dates in years, months, weeks, days, hours, and minutes.
Add or Subtract Time from a Date
Add or subtract days, weeks, months, or years to find a future or past date.
How to Use the Date Calculator
- Choose 'Date Difference' to calculate days between two dates, or 'Add/Subtract' to find a future/past date
- Enter the required dates using the date picker or manual input
- For Add/Subtract mode, choose operation and enter the amount of time to add or subtract
- Click 'Calculate' to see detailed results including years, months, weeks, days, and more
Features
- Calculate exact difference between two dates in multiple units
- Add or subtract days, weeks, months, or years from any date
- Business days calculator (excludes weekends)
- Shows day of the week for any date
- Works entirely in your browser - no data sent to servers
- Mobile-friendly responsive design
Frequently Asked Questions
How do I calculate the number of days between two dates?
Select the 'Date Difference' tab, enter your From Date and To Date, then click Calculate. The calculator will show you the exact difference in years, months, weeks, days, hours, and minutes, plus business days excluding weekends.
Can I add months or years to a date?
Yes! Use the 'Add/Subtract' tab. Enter your start date, select 'Add' as the operation, then enter the number of years, months, weeks, or days you want to add. The calculator will show you the resulting date and what day of the week it falls on.
What are business days and how are they calculated?
Business days are weekdays (Monday through Friday), excluding weekends. The calculator automatically counts business days when calculating the difference between dates. This is useful for project planning, delivery estimates, and work schedules.
How can I calculate someone's age in days?
Use the 'Date Difference' tab. Enter the person's birth date as the From Date and today's date (click 'Today' button) as the To Date. The calculator will show the total days lived, along with years, months, and weeks.
Can I calculate a date 90 days from today?
Absolutely! Go to the 'Add/Subtract' tab, click 'Today' to set the current date, select 'Add', enter 90 in the Days field, and click Calculate. The result will show the exact date 90 days from now and what day of the week it will be.
Is my date information secure and private?
Yes, completely! This date calculator runs entirely in your browser using JavaScript. No dates or calculations are ever sent to our servers or stored anywhere. All calculations happen locally on your device for total privacy.
Does the calculator account for leap years?
Yes! The date calculator automatically handles leap years (February 29th) and varying month lengths to provide accurate calculations. It follows the Gregorian calendar system used in most of the world.