➕ Date Add/Subtract Calculator

Add or subtract days, weeks, months, or years from any date. Calculate future or past dates instantly with accurate results.

Result Date

How the Date Add/Subtract Calculator Works

The date add/subtract calculator performs date arithmetic by adding or subtracting time periods from a given date. Here's how it works:

Add Days: Adds the specified number of days to your start date, accounting for month boundaries and leap years.
Subtract Days: Subtracts the specified number of days from your start date, going back in time.
Add/Subtract Weeks: Adds or subtracts weeks (7-day periods) from your date.
Add/Subtract Months: Adds or subtracts months, handling varying month lengths (28-31 days) and year boundaries.
Add/Subtract Years: Adds or subtracts years, properly accounting for leap years (especially February 29th).

The calculator handles all edge cases including leap years, month boundaries, and varying month lengths to ensure accurate results.

Common Use Cases

📅 Deadline Planning

Calculate deadlines by adding days, weeks, or months to a start date. Perfect for project planning and task scheduling.

📆 Event Planning

Plan events by calculating dates in the future. Add weeks or months to find the perfect date for your event.

💼 Business Planning

Calculate contract end dates, subscription renewals, or payment due dates by adding months or years to start dates.

📚 Academic Planning

Calculate assignment due dates, exam dates, or semester end dates by adding weeks or months to start dates.

🏥 Medical Appointments

Calculate follow-up appointment dates by adding weeks or months. Useful for scheduling recurring medical visits.

📊 Historical Dates

Calculate historical dates by subtracting years, months, or days. Useful for research and historical analysis.

Examples

Example 1: Add 30 Days

Start Date: January 15, 2025
Operation: Add 30 days
Result: February 14, 2025

Example 2: Subtract 2 Weeks

Start Date: March 1, 2025
Operation: Subtract 2 weeks
Result: February 15, 2025

Example 3: Add 3 Months

Start Date: November 15, 2024
Operation: Add 3 months
Result: February 15, 2025

Example 4: Add 1 Year

Start Date: February 29, 2024 (Leap Year)
Operation: Add 1 year
Result: February 28, 2025 (Non-leap year)

Frequently Asked Questions

How does adding months work?

When adding months, the calculator adds the specified number of months to the date. If the resulting day doesn't exist in the target month (e.g., January 31 + 1 month = February 28/29), it adjusts to the last valid day of that month.

What happens with leap years?

The calculator properly handles leap years. If you add a year to February 29 in a leap year, it will result in February 28 of the next year (if it's not a leap year) or February 29 (if it is a leap year).

Can I subtract dates?

Yes! Select "Subtract" as the operation to go back in time. You can subtract days, weeks, months, or years from any date.

What's the maximum date range?

The calculator works with dates from 1900 to 2100, covering the vast majority of practical use cases for date arithmetic.