Pick a start date and an end date; the day count and week-plus-day breakdown update as you change either field.
Change either date at any time and the result recalculates immediately - there is no separate "calculate" button to press.
If the end date comes before the start date, the tool still shows the day count and notes that the order is reversed, instead of showing a broken result.
Date Difference Calculator
Work out the number of days between two dates.
Use it to count days until a deadline, measure a duration, or check how long ago something happened.
The result also shows a weeks-and-days breakdown, not just the raw day count, and it works in either direction - if the end date is before the start date, the tool still gives you the day count and says so.
Does not provide medical or financial advice - results are general estimates only, and both dates are treated as midnight local time, so the count is a calendar-date difference rather than a precise elapsed-time count across time zones.
The calculation runs locally in the browser - no upload and no account.
Not sure this is the right way to count the days you need? See when to use the date difference calculator.
Frequently Asked Questions
What does Date Difference Calculator do?
Work out the number of days between two dates.
When should I reach for date difference calculator?
Use it to count days until a deadline, measure a duration, or check how long ago something happened.
What complementary tools work well alongside date difference calculator?
Works in either direction - if the end date is before the start date, the result says so.