Date Calculator
Days between dates, add or subtract.
- 100% free
- No sign-up
- Runs in your browser
Date maths without a calendar
How many days until the deadline? What date is 90 days from today? How many working days are left this quarter? Two modes answer all of these.
Weekday counting skips Saturdays and Sundays; public holidays vary by country and aren't excluded.
- 1
Choose a mode
Between dates, or add/subtract.
- 2
Enter the dates
Or an amount.
- 3
Read the result
Days, weeks and weekdays.
Frequently asked questions
Is the end date included?
No — the count is the number of days from the start date to the end date.
What happens when adding a month to 31 January?
Like most calendars, it rolls over to early March in shorter months.
Is my data uploaded anywhere?
No. Everything runs in your browser with JavaScript — nothing you type or open is sent to our servers.