Days Calculator
Calculate dates by adding or subtracting days
Select the starting date for your calculation
Enter a value between 0 and 99,999
Calculate dates by adding or subtracting days
Select the starting date for your calculation
Enter a value between 0 and 99,999
Pick a start date, add or subtract a number of days (0 to 99,999) and get the target date with its weekday — for deadlines, notice periods, return windows or visa stays. Export the result as an .ics file for Google Calendar, Apple Calendar or Outlook.
1 Mar 2026 + 30 days → 31 Mar 20261 Jan 2027 − 90 days → 3 Oct 202628 Feb 2028 + 1 day → 29 Feb 2028Yes. It counts calendar days, including weekends and public holidays. It does not calculate business days.
No. Adding 1 day to Monday gives Tuesday. The start date is day 0.
Yes. The calendar arithmetic includes 29 February in leap years.
Click “Export to Calendar” to download an .ics file, then open it with Google Calendar, Apple Calendar or Outlook.