How do I add days to a date?

Enter a start date and the number of days to add. The calculator shows the resulting date.

What are business days?

Business days are Monday to Friday, excluding weekends. Some regions also exclude public holidays.

📅 Date Calculator

Calculate days between dates or add/subtract days

Start Date

End Date

Total Days

Weeks

Months

Years

Start Date

Days to Add

New Date

Day of Week

Days Added

Start Date

Days to Subtract

New Date

Day of Week

Days Subtracted

What is a Date Calculator?

A date calculator helps you work with dates — whether you need to find out how many days are between two dates, add days to a date (like calculating a deadline), or subtract days (like finding a past date).

How to Use

Choose the mode: Days Between, Add Days, or Subtract Days
Enter the date(s)
Click the calculate button
See the result instantly

Common Uses

Days Between: Countdown to an event, project duration, age in days
Add Days: Calculate deadlines, return dates, future appointments
Subtract Days: Find past dates, calculate invoice due dates

Frequently Asked Questions

How do I calculate days between two dates?

Enter both dates in the "Days Between" tab. The calculator will show the exact number of days.

Does this include weekends?

Yes. The total days include weekends and holidays. For business days only, you'd need a separate business days calculator.

Can I calculate dates in the past?

Yes. Use the "Subtract Days" tab or enter past dates in the "Days Between" tab.