Calculate the exact number of days, weeks, months and years between any two dates. Or add and subtract days, weeks and months from any date. Free, fast and accurate — works for any date worldwide.
Our free date calculator helps you find the exact number of days, weeks, months and years between any two dates. Whether you need to calculate how many days until an event, how long ago something happened, or what date falls a certain number of days from now — this tool gives you the answer instantly.
Simply select a start date and an end date, then click "Calculate Difference." The result shows the total number of days, broken down into weeks, months, years, hours, minutes, and weekdays. Switch to the "Add / Subtract Days" tab to find what date falls a set number of days before or after any starting date.
A date calculator is one of the most universally useful tools — used by people in every country for personal, professional and legal purposes. Whether you call it a date calculator, date difference calculator, days counter or date duration calculator, this free tool gives you an instant, accurate answer.
Different countries write dates in different formats. The UK and most of the world use DD/MM/YYYY (day first), while the United States uses MM/DD/YYYY (month first). This calculator uses a date picker that avoids confusion — simply select the day, month and year from the calendar interface.
Calculate deadlines, project timelines, age calculations, pregnancy due dates, contract durations, and countdowns to holidays and events. The Quick Date Reference section below the calculator shows common milestones relative to today.