Enter two dates to see how many days are between them, with the equivalent in weeks and months.
Counting the days between dates
Finding the number of days between two dates is one of the most common planning tasks, behind everything from project timelines to travel itineraries to counting down a pregnancy. The arithmetic is straightforward once leap years are handled correctly.
This tool counts every calendar day, weekends included, and also shows the span in weeks and approximate months. Months are inherently fuzzy because they vary in length, so the month figure uses an average and should be read as a close estimate.
If you need only working days, weekends excluded, use the business days calculator instead, which is the right tool for shipping windows, payroll periods, and contractual deadlines.
The formula
Worked example
From Jan 1 to Dec 31 of the same year is 364 days, about 52 weeks.
How to read your result
This counts calendar days, including weekends. For working days only, use the Business Days Calculator.
Frequently asked questions
- Are both endpoints included?
- It measures the gap between the two dates; add one day if you need to count both endpoints inclusively.
- How are months estimated?
- Months use an average length (30.44 days), so they are approximate.
- Does order matter?
- No - the result is the absolute difference either way.
Related calculators
Age CalculatorWeeks Between Dates CalculatorBusiness Days CalculatorCountdown CalculatorTime Duration Calculator
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