Date Calculator
Calculate the difference between two dates, or add/subtract days, weeks, months, and years from any date.
What Is a Date Calculator?
A date calculator helps you compute the exact difference between two dates or find a new date by adding or subtracting a specific number of days, weeks, months, or years. It's essential for project planning, deadline tracking, travel planning, and any scenario where date arithmetic matters.
How to Use
Date Difference
- Select Date Difference tab.
- Enter a Start Date and End Date.
- See the exact difference in years, months, days, total days, business days, and weekend days.
Add / Subtract from Date
- Select Add to Date or Subtract from Date.
- Pick a start date and enter the number of years, months, weeks, and/or days to add or subtract.
- The resulting date is displayed instantly.
Features
- Three modes: Date difference, add to date, subtract from date.
- Business-day breakdown: See weekdays and weekend days separately.
- Flexible input: Add/subtract using any combination of years, months, weeks, and days.
- Relative display: Results show how the date relates to today (e.g., “45 days from today”).
Common Use Cases
- Project deadlines: “How many business days until the deadline?”
- Contract periods: “What date is 90 days from now?”
- Warranty expiry: “When does my 2-year warranty expire?”
- Event planning: “How many weeks until the event?”
- Age verification: “What date was 21 years ago?”
FAQ
Does it account for leap years?
Yes. The calculator uses JavaScript's Date object, which automatically handles leap years and varying month lengths correctly.
What counts as a business day?
Monday through Friday. Public holidays are not excluded since they vary by region. Weekend days are Saturday and Sunday.