Date Calculator
Pick two dates and get the exact number of days between them, with a breakdown in weeks, months and years.
Your dates stay in your browser. They are never uploaded or stored.
What the date duration calculator tells you
The main number is the exact count of calendar days between your two dates. This date duration calculator gives you that figure plus a breakdown in weeks, months and years. That is the figure most people need, whether they are counting down to a wedding, measuring a project timeline, or checking how long something has been going on. Below it you get three extra views of the same span: whole weeks with leftover days, approximate months, and approximate years.
The weeks figure is exact, since every week is exactly seven days. Months and years are approximations because months have different lengths. They use the average month of 30.44 days and the average year of 365.25 days, which accounts for leap years. For planning purposes that is close enough, and the exact day count is always there when you need precision.
Common ways people use it
Project managers use it to turn deadlines into day counts for schedules. Couples count the days to anniversaries and weddings. Employees check notice periods and probation lengths in contracts. Students work out how many study days are left before an exam. Parents count down to due dates. It also works backwards: put an older date first and a recent date second to find out exactly how long ago something happened.
One tip that saves confusion: the calculator counts the days between the dates, not including the start date itself. So if your start date is Monday and your end date is Tuesday, the answer is one day. That matches how most people think about durations in everyday life.
Frequently asked questions
How do I count the days between two dates?
Pick a start date and an end date in the calculator above. It counts every calendar day between them and shows the total, plus a breakdown in weeks, months and years.
Does the date calculator include the start and end dates?
It counts the number of full days between the two dates. The start date itself is not counted, so the day after your start date counts as day one.
Can I use it for dates in the past?
Yes. Put the earlier date in the start field and the later date in the end field, and it will count backwards just as well as forwards.
How accurate is the month and year breakdown?
The day count is exact. Months and years are approximations based on the average month (30.44 days) and average year (365.25 days), which is why they are shown with decimals.
Is my data stored anywhere?
No. The calculation runs entirely in your browser and your dates are never uploaded, saved or shared.
How do I calculate the number of business days between two dates?
A business days calculator counts only Monday to Friday, skipping weekends. As a quick estimate, take the total days, subtract two days for each full week in the range, then adjust for any holidays that fall on weekdays.
What is a date duration calculator used for?
People use it for project timelines, pregnancy due dates, visa stay limits, warranty periods, and counting down to events. Any time you need the exact span between two calendar dates, it beats counting on a calendar.