Date Calculator

Calculate Duration

Duration
-- Years, -- Months, -- Days

Add or Subtract a Duration

Resulting Date
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About the Date Calculator

The Date Calculator is a free tool with two functions: it can calculate the total duration (years, months, days) between two specific dates, or it can add or subtract a set duration from a starting date to find a new date.

How to Use the Date Calculator

  1. Select a Mode: Choose either "Duration Between Dates" or "Add / Subtract Dates" at the top.
  2. For Duration: Select a "Start Date" and an "End Date". The calculator will instantly show you the total time between them.
  3. For Add/Subtract: Select a "Start Date", choose "Add" or "Subtract", and then enter the number of years, months, or days you wish to calculate. The final date will appear in the result box.

Frequently Asked Questions (FAQ)

Q: Does the Date Calculator account for leap years?

A: Yes. The calculator automatically includes leap years (like February 29th) in its calculations for both duration and for adding/subtracting dates, ensuring an accurate result.

Q: What does 'Duration Between Dates' calculate?

A: It calculates the total time that has passed between two specific dates. The result is broken down into the total number of years, months, and days for easy reference.

Q: How do I calculate a date in the past?

A: Select the 'Add / Subtract Dates' tab. Choose your 'Start Date', then select the 'Subtract' option. Finally, enter the duration (e.g., 2 years, 5 months) you want to go back, and the resulting date will be shown.