A LITTLE GUIDANCE
Date Add & Subtract Calculator guide
Find the date reached after adding or subtracting a chosen calendar period.
How to use
- Choose the starting date.
- Select addition or subtraction, then set the number of days, weeks or months.
- Review the resulting date and compare other periods if needed.
Worked example
- Input
- Add one month to 2027-01-31.
- Result
- The result is 2027-02-28 because February 2027 has no 31st day.
Common questions
Does one month always mean 30 days?
No. Months move by calendar month. If the original day does not exist, the result uses the target month's last day. Choose days to add exactly 30 days.
Are weekends or public holidays skipped?
No. Days and weeks use calendar dates, with seven days per week. Use the business-day calculator to exclude weekends and selected dates.