What is the Date Calculator (Add or Subtract Days)?
Deadlines are often written as "within 30 days" or "90 days from the invoice date". The date calculator adds or subtracts any number of days, weeks, months or years, or business days that skip weekends.
Quick buttons give the date 7, 30, 60, 90 or 180 days from today. For the number of days between two dates use the Date Difference Calculator; to add hours to the current time use Hours From Now.
How to use the Date Calculator (Add or Subtract Days)
- Choose the start date (today by default).
- Choose add or subtract.
- Enter the number and unit: days, weeks, months, years or business days.
- Read the resulting date and weekday.
Example
90 days after 10 October 2026 is Friday, 8 January 2027. 20 business days after the same date is Friday, 6 November 2026.
Common uses
- Payment terms: 30, 45 or 60 days from an invoice
- Visa validity and 90-day stay limits
- Notice periods and probation end dates
- Return and warranty deadlines
- Medicine courses and follow-up appointments
Business days
Business days skip Saturdays and Sundays. Public holidays are not removed automatically, so check Pakistan Public Holidays and add a day for each holiday in the period.
More free date and time tools
Planning around dates usually needs more than one answer. These related tools work the same way, instantly in your browser and free:
- Days until any date: count down to an exam, trip or deadline.
- Date difference calculator: the exact time between two dates.
- Age calculator: your exact age in years, months and days.
- Time zone converter: the same moment in Pakistan, the Gulf, the UK and the USA.
- Online timer: a countdown with an alarm sound.
- Year calendar: all 12 months with week numbers and holidays.
Frequently asked questions
What is the date 90 days from today?
Click the "+90 days" button; the date and weekday appear instantly.
How do I add business days?
Choose "business days" as the unit; weekends are skipped.
What happens when adding a month to 31 January?
You get the last day of February.
Can I subtract days?
Yes, choose subtract to find a past date.
Are public holidays skipped?
No, only weekends. Add holidays manually.
Is the Date Calculator (Add or Subtract Days) free to use?
Yes. The Date Calculator (Add or Subtract Days) on Custom Converter is completely free, with no sign-up, no daily limit and no watermark.
Does the Date Calculator (Add or Subtract Days) work on mobile phones?
Yes. It is built mobile-first and works on Android phones, iPhones, tablets and computers in any modern browser, with no app to install.