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Date Difference: calculate the gap between two dates instantly
Fill in two dates and get the gap in years, months, days, and total days.
Fill in both dates to see the result.
Your data never leaves this browser.
Why use this Date Difference?
- Full breakdown. Years, months, days, total weeks, and total days, all in one view.
- Calendar-accurate. Counts each month's actual day total, not a rough average.
- Private by design. Every calculation runs in your browser.
How to calculate a date difference
- Fill in the start date in the first field.
- Fill in the end date in the second field.
- Watch the breakdown appear below.
When you need this calculator
An exact age down to the day, or an employee's tenure, needs a precise count.
A running project's duration, a contract's term, or a product's warranty period from the purchase date needs a quick check.
Frequently asked questions
Does the order of the start and end date matter?+–
Not at all. If the end date comes before the start date, this tool automatically flips the order.
Why does the year/month/day breakdown differ from total days divided by 30?+–
The breakdown counts each month's actual day total, 28 to 31 days, rather than assuming a flat 30-day average.
Do the start and end dates get counted?+–
The calculation is based on the pure time gap between two dates, matching standard calendar math.
Is my date data stored on a server?+–
No. Every calculation runs in your browser.