Date Difference Calculator
Find the exact difference between two dates in days, weeks, months, and years.
Result
📢 In-Calculator Ad — 468×60
What is this?
The Date Difference Calculator finds the exact span of time between any two calendar dates and expresses it in days, weeks, months, and years. It answers everyday questions such as how long a project will run, how many days remain before a deadline, or how much time has passed since an important event.
Date gaps matter in far more situations than people expect. HR teams calculate tenure for probation periods and benefits, project managers measure elapsed time against milestones, legal professionals count days for notice periods and filing windows, and travellers plan trips down to the exact number of nights between arrival and departure.
The tool computes the absolute gap between the two dates, so the result is the same no matter which date you enter first. Weeks come from dividing total days by seven, months are approximated using the average month length of 30.44 days, and years use the 365.25-day average year, which accounts for leap years. If you need an exact years-months-days breakdown between a birth date and today, use the Age Calculator instead; this tool is optimised for clean totals across long spans.
All calculations run locally in your browser, so the dates you enter are never sent to or stored on a server.
Date gaps matter in far more situations than people expect. HR teams calculate tenure for probation periods and benefits, project managers measure elapsed time against milestones, legal professionals count days for notice periods and filing windows, and travellers plan trips down to the exact number of nights between arrival and departure.
The tool computes the absolute gap between the two dates, so the result is the same no matter which date you enter first. Weeks come from dividing total days by seven, months are approximated using the average month length of 30.44 days, and years use the 365.25-day average year, which accounts for leap years. If you need an exact years-months-days breakdown between a birth date and today, use the Age Calculator instead; this tool is optimised for clean totals across long spans.
All calculations run locally in your browser, so the dates you enter are never sent to or stored on a server.
Formula
Days = |End Date - Start Date|
Weeks = Days / 7
Months = Days / 30.44 (approx.)
Years = Days / 365.25 (approx.)
Weeks = Days / 7
Months = Days / 30.44 (approx.)
Years = Days / 365.25 (approx.)
Frequently Asked Questions
How is the difference calculated?
The difference is calculated as the absolute number of days between the two dates.