Days Until Calculator
Count the days until a target date from today or from any start date you choose.
This is useful for deadlines, holidays, birthdays, launches, and reminders.
Result
--
Run the calculation to see the day countdown.
| Metric | Value |
|---|---|
| Total days | -- |
| Years | -- |
| Months | -- |
| Days | -- |
| Included target total | -- |
Quick Answer
The days until calculator counts how many days remain between a start date and a future target date.
How to Calculate
- Enter the start date, which defaults to today.
- Enter the target date.
- Choose whether to include the target day.
- Click Calculate.
Formula
Days until = target date - start date
If the target day is included, the total increases by one when the target is on or after the start.
Worked Examples
Example 1: Today to tomorrow is 1 day.
Example 2: Today to a date two weeks away is 14 days.
Example 3: A birthday countdown can be shown as a simple day total or as calendar units.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Total days | The exact remaining day count. | Use it for planning and reminders. |
| Calendar breakdown | The same span expressed in years, months, and days. | Useful for longer countdowns. |
| Error | The target date is earlier than the start date. | Choose a future target date. |
Frequently Asked Questions
Yes. The start date is editable, so you can count from any date you need.
Inclusive counting is useful when your rule counts both the start and target endpoints.
Yes. Long date ranges are shown as years, months, and days in the breakdown table.
Related Calculators
References
- OmniCalculator reference page
- The calculator measures the gap from a chosen start date to a target date.
- Last reviewed: March 2026.