Date Calculator
Days between dates, add or subtract days
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About this calculator
Work out how long until a deadline, how many days have passed, or what the date will be after a number of days. Business days (Monday to Friday) are counted too.
The formula
Days between = (end date − start date) ÷ 86,400,000 ms
Worked exampleFrom 1 January to 31 December 2026 → 364 days, 52 weeks.
Frequently asked questions
Is the end date included?
The count is the difference between dates. Add 1 if you want to count both ends.
Are business days exact?
They count Monday to Friday only and ignore public holidays.
Can I subtract?
Yes. Choose "Subtract from a date".
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