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Date & Business Days Calculator — Days Between Dates, Add Days, Workday Counter
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The All-in-One Date Calculator

Whether you need to know how many days are left until a deadline, calculate the date 90 days from now for a contract, or count business days between two dates for payroll, this calculator handles it all in three simple tabs.

Three Powerful Modes

ModeUse CaseExample
Days BetweenCount the total days, business days, and weekends between any two dates.How many days until Christmas? How many workdays in Q3?
Add/Subtract DaysFind the exact date a certain number of days from a given date.What date is 100 days from today? When is 30 business days before the deadline?
Business DaysDedicated view for counting only Mon–Fri working days between two dates.How many working days between hire date and project deadline?

Who Uses This Calculator?

  • HR & Payroll: Calculate probation periods, notice periods, and leave entitlements in business days.
  • Legal & Contracts: Determine filing deadlines, statute of limitations, and settlement dates.
  • Project Managers: Plan sprint durations and delivery timelines excluding weekends.
  • Couples & Families: Track anniversaries, pregnancy milestones, and D-Day countdowns.

Frequently Asked Questions

How do you calculate the number of days between two dates?
We compute the absolute difference between the two dates in UTC to avoid timezone and daylight-saving issues. The result is the total number of calendar days, which we also break down into weeks + remaining days, business days (Mon–Fri), and weekend days (Sat–Sun).
What counts as a business day?
A business day is any day from Monday through Friday. Saturdays and Sundays are excluded. Note that public holidays are country-specific and are not excluded by this calculator — only weekends are removed from the count.
Can I add or subtract business days instead of calendar days?
Yes. In the "Add/Subtract Days" tab, check the "Exclude Weekends" option. The calculator will then skip Saturdays and Sundays when counting forward or backward, giving you the resulting date in business days only.
What is a D-Day calculator?
A D-Day calculator counts the number of days from a reference date (often today) to a target date. It is commonly used for anniversaries, contract deadlines, exam countdowns, and pregnancy milestones. Our "Days Between" tab does exactly this.
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