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Date Calculator

Add/subtract dates and calculate differences

100% Private: All processing happens in your browser. No data is sent to any server.
Tip: Use negative numbers to subtract time. The difference calculation shows the absolute time between two dates.

What is Date Calculator?

Add or subtract years, months, and days from dates. Calculate the exact difference between two dates with detailed breakdown.

How to Use

  1. Choose between Add/Subtract or Calculate Difference mode
  2. Select a start date
  3. Enter years, months, or days to add/subtract
  4. Or select an end date to calculate difference
  5. View results instantly and copy with one click

Common Use Cases

  • Calculating project deadlines
  • Determining age or tenure
  • Planning future dates
  • Calculating time between events
  • Scheduling recurring events

Why Use Our Date Calculator?

✅ 100% Client-Side Processing

All processing happens in your browser. Your data never leaves your device.

🚀 Fast & Instant

No server delays. Process your data instantly without waiting.

🔒 Completely Secure

No data sent to servers means no risk of data breaches or leaks.

💰 Free Forever

No registration, no limits, no hidden costs. Use as much as you need.

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