Days Between Dates Calculator
Pick any two dates to see the exact number of days between them, with week and business-day breakdowns.
Counting days between dates
Project deadlines, visa windows, rental periods, pregnancy due dates, notice periods at work — life is full of questions that reduce to 'how many days is that?' Counting on a calendar is slow and error-prone, especially across month boundaries and leap years. This calculator gives you the exact answer instantly, plus useful breakdowns: whole weeks, remaining days, and business days.
Worked example: from 1 January 2026 to 20 October 2026 is 292 days — that is 41 weeks and 5 days, containing 208 business days (weekdays). The same span in a non-leap comparison, 1 January 2025 to 20 October 2025, is also 292 days because neither range crosses a February 29; spans that do cross one gain an extra day.
A common trap is inclusive versus exclusive counting. If a contract says 'within 30 days of 1 June', the deadline is 1 July by the standard exclusive convention. When money or legal rights depend on the count, always confirm which convention the document uses.
Frequently asked questions
How do I count the days between two dates?
Subtract the earlier date from the later one. This calculator does it with real calendar arithmetic in your browser, so month lengths and leap years are exact. The count is the number of full 24-hour periods between the two dates.
Does it include the start and end dates?
By default the result counts the days between the dates, excluding the start date — the standard convention (a hotel stay from Monday to Wednesday is 2 nights). If you need an inclusive count for a deadline, simply add 1.
What is a business day?
A business day is a weekday — Monday to Friday — excluding weekends. Our business-day count skips Saturdays and Sundays between your two dates. Public holidays differ by country, so they are not deducted.
How many days are in a leap year?
366. A leap year adds February 29, and it occurs in years divisible by 4, except century years, which must be divisible by 400 — so 2000 was a leap year but 1900 was not.