About the Date Difference Calculator
This calculator finds the exact gap between two dates. Pick a start and end date to see the total number of days, plus a breakdown in years, months and days and the number of weeks.
Optionally include the end day in the count when you need an inclusive total. Everything is computed locally in your browser.
Worked example: from 1 January to 31 January the exclusive gap is 30 days; tick “include the end day” and it becomes 31 days, with every readout — days, weeks and the years/months/days breakdown — updating together to match.