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Days until calculator

Count the days until or since a date, and find the date that is N days after a start date.

Countdown

D-365

365 days until Fri, Jan 1, 2027

  • Difference365 days52w 1d
  • Counting the earlier date as day 1Day 366e.g. days together

Date after N days

Fri, Apr 10, 2026

Day 100, counting the start date as day 1

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How to use

  1. In the countdown section, pick a target date. The start date is today by default.
  2. A later target shows D-days remaining; an earlier one shows D+days passed, plus which day it is if the earlier date counts as day 1.
  3. In the second section, enter a start date and a number of days to get the resulting date and weekday. Use the 100 or 1000 buttons as shortcuts.
  4. Press Share link to send your setup. If the start date is left as today, the link uses the recipient’s today.

FAQ

How is the countdown calculated?

It is the number of days from the start date to the target date, not counting the start date itself. Tomorrow is D-1, today is D-Day and yesterday is D+1.

What does “count the start date as day 1” do?

Anniversaries such as a 100th day are often counted with the first day as day 1, so day 100 falls 99 days after the start. Turn the option off to get the date exactly N days after the start.

Can time zones or daylight saving time shift the result?

No. Today comes from your device’s clock and time zone, and differences are calculated between calendar dates without times, so a 23- or 25-hour day still counts as one day.

Are leap years included?

Yes. It uses the Gregorian calendar: years divisible by 4 are leap years, except years divisible by 100 that are not divisible by 400. Dates from the year 1000 to 9999 are supported.

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