Online Date Calculator - Calculate Date Differences, Add/Subtract Dates

Free online date calculator to find the difference between two dates, add or subtract days, weeks, months, or years from a date, and calculate age. Perfect for planning and tracking.

Date Difference
Add/Subtract Time
Age Calculator

Note: Age is calculated from birth date to today.

About Date Calculator

Our versatile online Date Calculator helps you perform various date-related computations with ease. Whether you need to find the duration between two dates, add or subtract specific time periods, or calculate someone's exact age, this tool provides accurate and instant results.

Keywords: online age calculator, date duration calculator, date arithmetic, days between dates, date addition, date subtraction, calendar calculator
Key Features
  • Calculate difference between two dates (days, weeks, months, years)
  • Add or subtract days, weeks, months, or years from a base date
  • Calculate exact age from birth date to today
  • User-friendly date input fields
  • Instant results for all calculations
  • Completely free and accessible
How to Use the Date Calculator
  1. 1**Date Difference:** Enter a 'Start Date' and 'End Date' to find the duration between them.
  2. 2**Add/Subtract Time:** Enter a 'Base Date', choose 'Add' or 'Subtract', input an 'Amount', and select a 'Unit' (days, weeks, months, years) to find a future or past date.
  3. 3**Age Calculator:** Enter a 'Birth Date' to calculate the exact age in years, months, and days, along with total days, weeks, and months.
Why Use This Tool?
  • **Project Planning:** Estimate project durations or deadlines.
  • **Event Scheduling:** Plan events, anniversaries, or holidays with precise date calculations.
  • **Personal Finance:** Calculate loan durations, payment schedules, or investment periods.
  • **Health & Wellness:** Track pregnancy due dates, medication schedules, or fitness goals.
  • **Legal & Administrative:** Determine contract durations, notice periods, or age eligibility.
Common Use Cases
  • Calculating days until a vacation
  • Finding the exact age of a person or entity
  • Determining a future date after adding a certain number of days
  • Calculating the duration of a lease agreement
  • Planning a project timeline
Frequently Asked Questions

How accurate is the date difference calculation?

Our calculator provides highly accurate results based on standard calendar days, weeks, months, and years, accounting for leap years where applicable.

Does the 'Add/Subtract Time' feature account for leap years?

Yes, when adding or subtracting years, the tool correctly accounts for leap years to ensure the resulting date is accurate.

Can I calculate age for a future date?

The 'Age Calculator' specifically calculates age relative to today's date. For future date calculations, you can use the 'Date Difference' section.