Date Difference Calculator
Choose a start and end date to see exactly how much time lies between them — in days, weeks, months and complete years.
Measuring the distance between two dates
"How many days is that?" is one of the most common questions in ordinary life, and one of the easiest to get slightly wrong by hand. Months are different lengths, leap years sneak an extra day into February, and it is surprisingly easy to miscount across a year boundary. This calculator removes the guesswork. Give it a start date and an end date, and it returns the exact number of days between them, along with the same span expressed in weeks, in months, and in complete years, months and days for a fuller picture. You see the answer instantly, and you can change either date to explore different spans.
Where it earns its keep
The uses are everywhere once you start looking. Landlords and tenants count notice periods; freelancers and agencies count billing cycles; travellers count the length of a trip or the days remaining on a visa; expectant parents count the weeks of a pregnancy; students count the days until results; and anyone planning an anniversary or a reunion counts the years that have quietly passed. Because the tool is precise about leap years and month lengths, you can rely on it for the kinds of dates where being a single day out actually matters, such as contracts, deadlines and official forms.
Counting days the way you mean it
People count days in two slightly different ways, and it helps to be clear about which you want. Sometimes you want the number of nights between two dates, as a hotel would count them, and sometimes you want to include both the first and the last day, as you might when counting how long an event runs. This calculator reports the plain gap in days, which you can adjust by one depending on whether you wish to include the final day. If you only want to count the days you actually work, the working-days calculator does the same job while skipping every Saturday and Sunday. To look forward to a single upcoming moment rather than measure a span that has already passed, switch to the countdown timer, and to measure from your own birth date, use the age calculator. Together they cover almost every way there is to ask how much time lies between two points.