Free Online Date Calculator
Useful for deadlines, rental periods, project plans and any question about how long something lasts.
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How to use Date Calculator
- Choose Count between or Add to date.
- Enter the dates and the number of days.
- Decide whether weekends and holidays count.
- Read the result date and the total.
Questions about Date Calculator
Is the end date included?
By default the difference counts full days between the two, so the tool states clearly whether either day is included.
Can I subtract business days?
Yes, switch to working days; public holidays still need to be counted by hand.
About Date Calculator
Add or subtract days and find date differences with our free online Date Calculator. 100% browser-based, fast, and private—no login or file uploads required.
These calculators and converters turn everyday numbers into answers instantly: percentages, BMI, loans and interest, units, colours and dates, with the formula shown so you can check the working.
This tool runs in your browser. The file is not uploaded. Results update as you type and are rounded for display; for money or legal figures keep the unrounded value and double-check against your own spreadsheet before relying on it.