ToolwebHow to use this tool
- Choose the target date and adjust the reference date if needed.
- Distinguish the countdown from the duration including both dates.
- Choose a card title and shape, then save the PNG.
Example input and result
- Input and settings
- 2026-10-28 → 2026-11-27
- Result
- D−30; 31 days including both dates
Count dates rather than elapsed hours
Dates are compared as UTC calendar values. A daylight-saving day with 23 hours still counts as one day. The target date displays D-DAY and a past target uses D+.
Save a card explicitly
The card contains your chosen title and dates. Its preview lives in this tab; only the save action creates a device file. Nothing posts it to a sharing service or places your dates in the address.
Common questions
Why does D−30 have an inclusive duration of 31 days?
The difference counts date transitions to the target. An inclusive duration also counts the reference date itself.