How are the days remaining until a target date counted?

It counts the days between the target date and the reference date, and the reference date is set to today automatically when you open the tool. Just pick the target date to see the days left, also shown as weeks and months.

Why do the months differ slightly from the calendar?

The month figure is an approximation based on one month being about 30.4 days, so it can be a little off from the exact number of calendar months. Rely on the day count for precision.

What happens if the target date has already passed?

If the target date is before the reference date, it shows how many days have elapsed since then, which is useful for counting days since an anniversary. When the two dates are the same, it simply shows Today.

How Many Days Until? Countdown Calculator

Instantly count how many days are left until your target date. Get the days, weeks, months, and weekday remaining to an exam, birthday, anniversary, or deadline. For past dates, see how many days have elapsed.

Last updated: June 25, 2026

Input

Target date

YYYY/MM/DD

Reference date (defaults to today)

YYYY/MM/DD

Result

Enter a target date and a reference date.

How it works

Enter a target date and a reference date to count the days between them. The reference date is automatically set to today when you open the page, so you only need to pick a target date to see the days remaining.
The remaining days are also shown converted into weeks and months. Months are an approximation (1 month is treated as about 30.4 days), so they may differ slightly from exact calendar months.
Both the reference and target dates can be changed freely. You can combine past and future dates to measure the gap between any two days.
If the target date is before the reference date, the tool shows the number of days that have elapsed since then. This is handy for counting days since an anniversary or how many days have passed since an event.
When the target and reference dates are the same, the result shows "Today," which is useful for confirming the day has arrived.
Share the result to X with one tap. Great for keeping a countdown to an exam, birthday, event, or deadline.

Frequently asked questions

How are the days remaining until a target date counted?: It counts the days between the target date and the reference date, and the reference date is set to today automatically when you open the tool. Just pick the target date to see the days left, also shown as weeks and months.
Why do the months differ slightly from the calendar?: The month figure is an approximation based on one month being about 30.4 days, so it can be a little off from the exact number of calendar months. Rely on the day count for precision.
What happens if the target date has already passed?: If the target date is before the reference date, it shows how many days have elapsed since then, which is useful for counting days since an anniversary. When the two dates are the same, it simply shows Today.

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