Add / Subtract Days
Quickly add or subtract a number of days from a date to find the exact resulting date and weekday.
Resulting date
2025-04-01
- Day of week
- Tuesday
Updates live as you type
Frequently asked questions
Set the start date to today, choose “Add days”, and enter 90. The calculator returns the exact date three months out and the weekday it falls on.
Choose “Subtract days” and enter how many days to go back. This is handy for finding when to start a task that must finish by a deadline.
No. This counts calendar days, including weekends and public holidays. For business-day counting, exclude those separately.
It is a streamlined, days-only version for the most common case. Use the full date calculator when you need weeks, months or years as well.
90 days spans three different month lengths — this handles it silently
Starting from 1 January 2025 and adding 90 days lands on 1 April 2025, a Tuesday. That single number quietly crosses 31 days of January, 28 of February, 31 of March, and one day into April — three different month lengths chained together — without needing to count any of it out on a calendar. Switch the same start date and amount to "subtract" instead, and the result lands on 3 October 2024.
What makes this different from the full date calculator
This is a days-only tool, deliberately narrower than the full date calculator, because "how many days from this date" is the single most common version of the question — most people don't need to think in weeks, months or years for it. Enter a start date, choose add or subtract, type a number of days, and get back both the resulting date and its weekday immediately.
What "calendar days" means here, and where to go for more
The calculation counts calendar days, including weekends and holidays — this tool intentionally stays simple and universal rather than trying to guess a specific region's working-day or holiday calendar, which varies too much to bake in reliably. If a use case needs only working days, subtract those separately for the relevant region. Leap years never trip up the count regardless of how far forward or back the calculation runs, since the underlying date logic is calendar-accurate throughout. For adding or subtracting weeks, months or years instead of just days, the full date calculator is the next step up; for the gap between two dates already known, the days-between-dates calculator answers that instead.