Date Calculator Add or Subtract Days From a Date
Choose one option:
Step 1: Pick a start date
Step 2: Enter how much time (the answer updates as you type)
Step 1: Pick the two dates (the answer updates as you choose)
Private by design: all date maths runs in your own browser. Nothing is sent to QuickOnlineTips or stored. Business days skip Saturdays and Sundays but not public holidays.
© 2004–2026 QuickOnlineTips. This tool’s code and design are our own work. You are welcome to use it here for free, but please do not copy, republish or sell it. Terms of use
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More date and time tools
About this tool
This free date calculator adds or subtracts days, weeks, months and years from any date, and counts the days between two dates. It can count business days only (Monday to Friday), shows the day of the week, week number and day of the year, and works out the answer as you type.
Quick answer: Use Option 1 to find a date in the future or past: pick a start date, choose Add or Subtract, and type the years, months, weeks or days. Use Option 2 to count the days between two dates, with business days, weekends, weeks and months shown too.
How to add or subtract days from a date
- Pick the start date. It is set to today when the page opens.
- Press + Add or − Subtract.
- Type any mix of years, months, weeks and days. The new date appears straight away.
- Tick business days if weekends should not count, for example for delivery times or deadlines.
Months are added on the calendar, so 31 January plus 1 month gives the last day of February. Years and months are added first, then weeks and days.
How to count days between two dates
Choose Option 2 and pick the two dates. You get the total days plus the same span in weeks and days, months and days, years, months and days, business days, weekend days, hours and minutes. Tick Include the end date when both the first and last day count, such as a hotel stay counted in days or an event that runs from Monday to Friday.
Common uses
- Deadlines and notice periods: 30, 60 or 90 days from a date.
- Delivery and working-day estimates, such as 10 business days from an order.
- Pregnancy, warranty and subscription dates.
- Counting how long ago something happened, or how long a project ran.
Need your age instead? Try the age calculator. To see a live countdown, use countdown to a date, or print a free calendar.
FAQ
Does the business day count skip holidays?
It skips Saturdays and Sundays only. Public holidays differ by country and region, so subtract any that fall in your range yourself.
What is the week number?
It is the ISO 8601 week number used in Europe and much of the world: weeks start on Monday and week 1 contains the first Thursday of the year.
Can I count backwards?
Yes. Press Subtract in Option 1, or put the later date first in Option 2. The tool shows the number of days either way.
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