Add or Subtract Days

Enter today’s date in the Start date field, set the unit to Days, enter 30, and click Add. The calculator instantly shows the result date. For example, if today is June 21, 2026, then 30 days later is July 21, 2026.

Set the start date to today, choose Days as the unit, enter 90, and select Add. The result appears instantly. 90 days is commonly used for visa validity windows, contract notice periods, probationary periods, and quarterly deadlines.

Select Months from the Unit dropdown, enter the number of months, and click Add. The calculator handles month-end edge cases automatically — for example, adding 1 month to January 31 gives February 28 (or 29 in a leap year).

Set the start date to today, choose Days as the unit, enter 30, and click Subtract. The result shows the date exactly 30 days in the past. You can also click the “−30 days ago” row in the quick reference table below the calculator.