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Date & time

Date Difference Calculator

Count the days and full weeks between two calendar dates.

Date conventions explained belowClear start and end values

Set your dates & time

Runs on your device

TIME SUMMARY

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter start date, end date.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Elapsed days = (end date − start date) in calendar days. Full weeks = floor(days ÷ 7).

A WORKED EXAMPLE

January 1 to February 1, 2026 is 31 days: 4 full weeks and 3 days.

What to keep in mind

The start is included and the end excluded. The same date gives zero days. This does not count hours or local daylight-saving transitions.

Common questions

How do I include the end date too?

Add one day to the elapsed-day result when you need an inclusive count of both dates.

Are leap years supported?

Yes. Calendar arithmetic includes February 29 in leap years.

Methodology maintained by ClarityKit. How these tools are built and checked.