Add or Subtract Days from a Date
Find the date that is a given number of days before or after any date. Handles month rollovers, leap years and year boundaries.
How it works
Enter any start date and a number of days, then choose add or subtract. The result shows the new date in both YYYY-MM-DD and human-readable form, with the day of the week.
Adding days past a month end rolls over correctly: January 31 + 1 day is February 1, not February 32.
Leap years are respected: adding one day to February 28 gives February 29 in a leap year and March 1 otherwise.
Frequently asked questions
What is 90 days from today?
Enter today as the start date, choose "Add days" and type 90. Ninety-day deadlines are one of the most common reasons people use this tool.
Does it count calendar days or working days?
This tool counts calendar days, including weekends. For working days only, use the Business Days Calculator.
Can I subtract to find a past date?
Yes. Choose "Subtract days" to go backwards from your start date.