Days Calculator

Count the exact number of days between two dates, or find the date that falls a given number of days before or after another — including a business-days-only count that skips weekends.

Mode

Start date

End date

Business days count Monday–Friday only and don't exclude public holidays, which vary by country and region. Today is —.

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Why use Days Calculator?

Date arithmetic looks simple until leap years, month-length differences, and weekday alignment get involved — which is why "just count on a calendar" reliably produces off-by-one errors for anything more than a couple of weeks out. This calculator handles both directions: counting the exact span between two dates, and projecting forward or backward from a date by a number of days. The business-days count is the detail most date calculators skip or get wrong. It counts only Monday through Friday within the range — useful for contract terms, shipping estimates, and payroll periods that are specified in business days rather than calendar days. It does not subtract public holidays, since those vary too much by jurisdiction to assume correctly; treat the business-days figure as the weekday count and adjust for known holidays yourself.

Key benefits

Both duration and date-shifting in one tool
Business-days count (Monday-Friday) included
Handles negative offsets (subtracting days)
Always calculated against today's actual date

Features

Days-between mode with weeks/days and business-days breakdown
Add-or-subtract mode for finding a future or past date
Full weekday and date display

Popular use cases

Counting down to a deadline or event
Working out a delivery or contract date N business days out
Checking how many days until or since a specific date
Project planning with weekday-only counts

How to use Days Calculator

1
Pick a mode
Days between two dates, or add/subtract days from a date.
2
Enter your dates
Start and end dates, or a start date plus a number of days.
3
Read the result
Total days, weeks and days, business days, or the resulting date.

Frequently asked questions

How do I calculate the days between two dates?

Enter both dates in 'days between' mode. The result shows total calendar days, that total expressed as weeks and remaining days, and a separate business-days count that excludes Saturdays and Sundays.

Does the business-days count exclude holidays?

No — it counts Monday through Friday only. Public holidays vary by country, region, and even company, so they aren't subtracted automatically; adjust the result manually for known holidays in your calendar.

How do I find the date 90 days from today?

Switch to 'add or subtract days' mode, leave the start date as today, choose Add, and enter 90. The resulting date and its weekday display instantly.

Can I calculate days in the past?

Yes — enter an end date before the start date in 'days between' mode for a negative result, or use 'subtract' in the shift mode to go backward from a date.

Last reviewed: August 2026

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