Add Days to Date Calculator: Add or Subtract Days, Weeks, Months, Years
Pick a date and add or subtract days, weeks, months or years to get the new date and its weekday.
- Nothing you type is stored
- Free
- No signup
New date
Tue, 2 Feb 2027
- Start date
- Wed, 4 Nov 2026
- Days apart
- 90 days
Quick list of common deadlines
| Days | Date |
|---|---|
| 7 | Wed, 11 Nov 2026 |
| 15 | Thu, 19 Nov 2026 |
| 30 | Fri, 4 Dec 2026 |
| 45 | Sat, 19 Dec 2026 |
| 60 | Sun, 3 Jan 2027 |
| 90 | Tue, 2 Feb 2027 |
| 180 | Mon, 3 May 2027 |
| 365 | Thu, 4 Nov 2027 |
How to use
- Enter the start date (today is filled in).
- Choose add or subtract.
- Enter the number and choose days, weeks, months or years.
Good to know
Days and weeks are added on the calendar: 27 October + 90 days is 25 January. Weekends are counted; for working days only, use the working days calculator.
Months and years keep the same day of the month. When that day does not exist, the last day of the month is used: 31 January + 1 month = 28 February (29 in a leap year).
The quick list shows common deadlines such as 7, 15, 30, 45, 60, 90, 180 and 365 days from the start date. Many official deadlines are counted "from the date of" an event; check whether the first day itself is counted in your case.
Questions
What date will it be 90 days from today?
Keep today as the start date, choose add, enter 90 days. The 90-day row is also in the quick list.
How do I subtract days from a date?
Choose subtract and enter the number of days. For example, 30 days before 15 March 2027 is 13 February 2027.
What happens when I add a month to 31 January?
February has no 31st, so the result is the last day of February. A note tells you when this happens.
Does adding days skip weekends or holidays?
No, every calendar day counts. Use the working days calculator to count only business days.
Is my data stored?
No. Everything is calculated on your device and nothing is sent anywhere.