Add or subtract days from a date
Give me a date and how many days to add or subtract. Count every day, or working days only.
Your figures
Result
- Falls on a
- Wednesday
- Non-working days skipped
- 0
- Calendar days elapsed
- 30
What we assume
- With calendar days everything counts, weekends and holidays included.
- With working days, Saturdays, Sundays and Spanish national public holidays are skipped. The site is run from Spain and that is the holiday calendar it carries.
- Holidays are loaded for 2025 to 2028; outside that range only weekends are skipped.
How it is calculated
Adding calendar days is straight arithmetic on the calendar, with leap years already handled. Adding working days is a different job: you step forward day by day, skipping the ones that do not count, until you have accumulated the number you asked for.
That difference matters more than it looks. A "15 day" deadline does not land on the same date depending on whether it is counted in calendar or working days, and the gap between the two can be three weeks.
An example
Add 1 working day to Friday 5 June 2026 and you get Monday 8 June: two weekend days were skipped. Add 1 calendar day and you get Saturday the 6th.
Frequently asked questions
What is the difference between calendar and working days?
Calendar days are every day on the calendar. Working days exclude Saturdays, Sundays and public holidays. Many legal deadlines are counted in working days, so it is worth checking which one applies to you.
Does it skip my region public holidays?
No. Only Spanish national ones. If your region or town has its own holidays in that period, the real date will be a few days later.
Keep calculating
All tools →- Days between two dates calculatorEnter two dates and we tell you how many days lie between them, broken down into weeks, spare days and hours.
- Difference between two dates in years, months and daysRather than counting loose days, this gives you the difference the way you would say it out loud: "2 years, 3 months and 5 days".
- Working days between two datesCount only the real working days between two dates: weekends come out, and public holidays too if you want them to.
- Exact age calculatorEnter a date of birth and we work out the exact age in years, months and days, plus how long is left until the next birthday.
- Work hours calculatorWith your start time, finish time and break, we work out the effective day and what it adds up to over a week, a month and a year.
- Week number of the yearWhich week of the year a date falls in, under ISO 8601, which is the standard businesses use and does not always match what you would guess.
Updated on 2026-08-26. Calculations run in your browser; nothing you type is sent to a server.