Date plus·minus
Find the date N days before or after the specified date.
Input
The example value has been entered. Check it immediately or change the value.
Input is processed in the browser. Refreshing returns a sample value.
Result
Check or change the value using the example value result.
Calendar dates are calculated without time zone changes. Enter valid dates between 1900 and 2100.
Share result
Share the tool link and result text together. No URL is included in the result. Check the below content and then share it.
Calculation·conversion criteria
Find the date N days before or after the standard date.
Input example
2026–10–02 plus 30 days = 2026–11–01
Adding 10 days to 2026-10-02 gives 2026-10-12. To count 10 days with the reference date as day 1, add 9 days.
How to use
- Use the entered example value or change the start date, additional days (subtracting is negative) items.
- Click Verify result and check the following result.
- Result can be copied if needed.
Frequently Asked Questions
Will weekend and holidays be skipped?
Skips. Adds or subtracts whole days including all calendar dates. Negative days move to the past; check the number of weekdays separately in the weekday tool.
Calculation criteria and reference materials
The calculation formula and scope of this tool are disclosed in the above description. Examples can be checked by substituting input values into the formula or following the specified string and calendar handling rules.
Verification of calculation criteria: · Calculation·verification principles · Report errors