Ori ToolsHow to use
- Open Add or Subtract Days from a Date and review the inputs below.
- Enter your values and check the units shown beside each field.
- Adjust the options, then press Run or Calculate. Interactive tools show their own start controls in the result area.
- Review the result. Use the copy or download control when it is available.
Inputs and starting values
| Input | Starting value / example | Available options |
|---|---|---|
| Reference date | 2026-11-02 | |
| Days to add | 100 | |
| Months to add | 0 | |
| Years to add | 0 |
Things to check
Years and months are added first (a missing date moves to the month's last day), then days. Korea's 100th-day count treats the birth day as day 1, so it is +99 days.
The starting values are examples, not recommendations. Check the units and replace them with your own values.
For taxes and benefits, verify the applicable date, rates and eligibility with the relevant official agency.
Frequently asked questions
Are my inputs and files uploaded?
The tool processes inputs in your browser without uploading them. Browser storage, microphone or sensor permissions are described by the tool when applicable.