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Date Difference in Days, Weeks, Months, and Years Calculator

Number of days between two dates.

Given the difference in days between two dates, converts to weeks, approximate months (÷30.44), and years (÷365.2425).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

weeks = days/7; months ≈ days/30.44; years ≈ days/365.2425

In depth

Given the difference in days between two dates, converts to weeks, approximate months (÷30.44), and years (÷365.2425).