How to use the Days Until Calculator (Countdown)
- Check the start date. It is today by default.
- Pick the target date.
- Read the number of days and whether it is ahead or behind.
- See the weeks and days and the weekday of the target.
Formula used
Days = (target date − start date) ÷ 86,400,000 ms. Weeks = whole days ÷ 7, with the remainder in days.
Worked example
Here is the Days Until Calculator (Countdown) worked through with the example values shown above, so you can check each step by hand.
| Inputs | |
|---|---|
| Target date | 2026-12-25 |
| Result | |
| Days | 56 |
| Status | 56 days to go |
| In weeks and days | 8 weeks and 0 days |
| Target date falls on a | Friday |
How the countdown works
The days are the difference between the two dates, counting midnight to midnight. From 30 October to 25 December 2026 there are 56 days, which is 8 weeks and 0 days, and 25 December 2026 falls on a Friday. Tomorrow is 1 day away and today is 0.
Because the start date is not counted as a day to go, the result is the number of nights between the dates. If you want to include the start day as well, add one.
Looking back
If the target date is earlier, the calculator counts back. A target of 1 October 2026 from 30 October is 29 days ago. This is useful for work out how long ago something happened, or how many days since a start date.
The calculator also works for longer spans: from 1 January to 31 December 2026 is 364 days. For the gap broken into years, months and days, use the days between dates calculator.
Planning with the number
Weeks are easier to plan with than days: 8 weeks to a deadline is eight working weeks, or about 40 business days. Use the business days calculator to remove weekends and holidays for a realistic number of working days.
Countdowns also help with habits and goals: 100 days to an exam gives a daily plan, and the weekday of the target helps you check that it is not a holiday or a rest day.
Time zones and the date line
The calculator works with calendar dates, not times, so it ignores time zones and daylight saving changes. The "today" it uses comes from your device’s clock.
For an event in another time zone, the date there may differ from your date. Check the local date of the event and enter that.
Frequently asked questions
Does the countdown include today?
No. It counts the days between the dates, so tomorrow is 1 day away.
Can I count from a date other than today?
Yes. Change the From date to any date.
What happens if the date has passed?
The result shows how many days ago it was.
How many weeks is that?
The weeks and days row splits the result into whole weeks and leftover days.
Does it count working days?
No, it counts calendar days. Use the business days calculator for working days.
Is it affected by leap years?
Yes. It uses the real calendar, so 29 February is counted in leap years.
This calculator gives estimates for information only. Actual figures from a bank, employer, tax authority or doctor may differ. It is not financial, tax, legal or medical advice.