Everyday calculator
Use this free date duration calculator to count exact calendar days, weeks, months, years, and Mon–Fri business days between two dates—or add/subtract days.
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When counting days between two dates, check whether your contract, hotel booking, or visa rule counts nights (exclusive) or calendar days occupied (inclusive):
10 − 1 = 9 days (9 hotel nights).10 full days. Check Include end date in count for inclusive schedules.YYYY-MM-DD format into the custom holidays box to deduct weekday holidays from your working-day total.By default it calculates the difference (End − Start), matching standard subtraction and hotel-night rules. Enable "Include end date in count (+1 calendar day)" when both start and end dates are full active days.
The calculator automatically detects reversed chronological order, displays the exact positive duration, and notes that the end date precedes the start date (or click "Swap dates" to flip them).
Every Monday through Friday in the date span counts as 1 working day, while Saturdays, Sundays, and any valid weekday dates listed in your custom holidays field are excluded.
When adding calendar months lands past the end of a shorter month (such as February), the date clamps cleanly to the final valid day of that month (February 28, or February 29 in a leap year).
Yes. All calculations use Gregorian calendar rules including 366-day leap years.
No. Dates are evaluated using timezone-neutral UTC calendar days so local clock shifts never alter day counts.
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