# Date Difference Calculator

> Find the exact calendar difference and total days between two dates.

Page: https://askcalculators.com/calculator/date-difference-calculator/
Definition: https://askcalculators.com/calculator/date-difference-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/date-difference-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/date-difference-calculator/?startDate=2026-01-01&endDate=2026-08-18

## Inputs
- startDate: Start date; type=date; required; default=2026-01-01
- endDate: End date; type=date; required; default=2026-08-18

## Outputs
- exactDifference: Exact difference; format=text; primary
- totalDays: Total days; format=integer
- weeksAndDays: Weeks and days; format=text
- averageMonths: Average months; format=number

## Formula
Exact difference uses calendar years, months, and remaining days

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.