How do I calculate the difference between two dates?

Select the 'Date Difference' tab, choose your start and end dates, and the calculator automatically shows the difference in years, months, weeks, days, hours, minutes, and seconds with a detailed breakdown.

Can I add or subtract time from a date?

Yes! Use the 'Add/Subtract' tab to add or subtract years, months, weeks, or days from any date. Enter the base date, specify the amount to add or subtract, and see the result instantly.

How do I calculate someone's age?

Switch to the 'Age Calculator' tab, enter the birth date, optionally select a comparison date, and see the exact age in years, months, days, hours, minutes, and seconds. Enable live update to see age update in real-time.

What date formats are supported?

The calculator supports standard date formats. You can use date pickers or enter dates manually. The calculator handles leap years, different month lengths, and time zones correctly.

Can I see detailed breakdowns?

Yes! The calculator provides detailed breakdowns showing years, months, weeks, days, hours, minutes, and seconds. For age calculations, you also see total days lived, next birthday countdown, and day of week information.

Is the date calculator free?

Yes, completely free! No registration, no limits, no hidden fees. All calculations happen in your browser - we never see or store your data.

📅 Date & Age Calculator - Calculate Date Differences & Age

Calculate the difference between two dates, add/subtract time from dates, and calculate exact age in years, months, days, hours, minutes, and seconds. Free online date and age calculator with detailed breakdowns.

Date Calculator

Operation:

Date 1

Date 2

Auto-calculate as you change values

Results

Enter dates to calculate

Results will appear here

What is a Date Calculator?

A date calculator helps you perform calculations with dates. You can calculate the difference between two dates in years, months, weeks, days, hours, minutes, and seconds. You can also add or subtract time periods (years, months, weeks, days) from any date to find future or past dates.

Our free date calculator provides detailed breakdowns of date differences and allows you to add or subtract any combination of years, months, weeks, and days from a base date. Perfect for project planning, deadline calculations, age calculations, and date arithmetic.

How to Use Our Date Calculator

Calculate Difference Between Dates:

Select "Difference" operation
Enter Date 1 and Date 2
See detailed breakdown in years, months, weeks, days, and total time units
View which date comes first

Add or Subtract Time from a Date:

Select "Add" or "Subtract" operation
Enter a base date (or use quick presets like "Today", "Tomorrow")
Enter years, months, weeks, and/or days to add or subtract
See the calculated result date with day of week

Common Use Cases

📅 Project Planning

Calculate project durations, deadlines, and milestones. Add weeks or months to start dates to find completion dates, or calculate time between project phases.

📆 Event Planning

Plan events by calculating how many days until an event, or find dates for recurring events by adding weeks or months to a base date.

⏰ Deadline Calculations

Calculate how many days, weeks, or months until a deadline. Add time periods to current date to find when tasks should be started.

📊 Age Calculations

Calculate age differences between people, or find someone's age on a specific date. Useful for legal, educational, or personal purposes.

📝 Contract & Subscription

Calculate subscription end dates, contract expiration dates, or trial periods by adding months or years to start dates.

🗓️ Calendar Planning

Plan schedules, appointments, and recurring events. Calculate dates for "every 2 weeks" or "every 3 months" from a starting date.

Key Features

✓Date Difference: Calculate precise difference between two dates in years, months, weeks, days, hours, minutes, and seconds.
✓Add/Subtract Time: Add or subtract any combination of years, months, weeks, and days from any date.
✓Quick Presets: Use presets like "Today", "Tomorrow", "Next Week", "Last Month" for quick date selection.
✓Detailed Breakdown: See not just total days, but also years, months, weeks, and smaller time units.
✓Direction Indicator: See which date comes first when calculating differences.
✓Auto-Calculate: Enable auto-calculation to see results update automatically as you change values.
✓Export Results: Save calculations to a text file with all details for records.

Frequently Asked Questions

How accurate is the date calculation?

Our calculator accounts for leap years, different month lengths, and handles edge cases accurately. When adding months or years, it correctly handles month-end dates and leap years.

What happens if I add months to a date that doesn't have that day?

For example, adding 1 month to January 31 results in February 28 (or 29 in leap years). The calculator automatically adjusts to the last valid day of the target month.

Can I calculate negative differences?

Yes! If Date 1 is after Date 2, the calculator shows the absolute difference and indicates which date comes first. All time units are positive, but the direction is clearly indicated.

How are weeks calculated in the difference?

Weeks are calculated as total days divided by 7 (rounded down). This gives you the number of complete weeks between the two dates.

Can I subtract time from a date?

Yes! Use the "Subtract" operation to subtract years, months, weeks, or days from a base date. This is useful for finding past dates or calculating "X days ago" scenarios.

Are my dates stored?

No, all calculations happen in your browser. We never see, store, or transmit any of your dates or personal information. Your privacy is completely protected.