Instructions
Days until a date
How to use
Choose a reference date and target date. Choose whether to include the first day.
Choose a reference date and target date. Choose whether to include the first day.
Supported input
Calendar dates from 1900 to 9999; UTC day arithmetic avoids daylight-saving errors.
Input example
2026-10-13 → 2026-10-20
Result example
D-14
Troubleshooting
Check required inputs, numeric ranges and the selected conversion direction. Choose a reference date and target date. Choose whether to include the first day.
Limitations
Calendar dates from 1900 to 9999; UTC day arithmetic avoids daylight-saving errors.
How it works
Find how many days remain before an event. Calendar dates from 1900 to 9999; UTC day arithmetic avoids daylight-saving errors.
Units & precision
Calendar dates from 1900 to 9999; UTC day arithmetic avoids daylight-saving errors.