What the countdown counts
The number of whole days between today and your target date, not counting today. If the date is tomorrow the answer is 1. If it is today the answer is 0, and the page says so rather than showing a countdown to a date that has arrived.
Alongside the day count you get the figure in weeks and days, the number of working days remaining after weekends and US federal holidays are removed, and the day of the week the date falls on. The working-day figure is usually the one that matters for a deadline and it is usually much smaller than people expect — 30 calendar days is normally 21 or 22 working days.
Worked example — a deadline six weeks out
From 18 August 2026, a target of 29 September 2026 is 42 days away. That is 6 weeks exactly. Removing twelve weekend days leaves 30 weekdays, and removing Labor Day on Monday 7 September leaves 29 working days. If your plan assumed six working weeks you are one day short of that; if it assumed forty-two working days you are thirteen days short.
Dates that have passed
Enter a past date and the page counts up instead of down, telling you how long ago it was. Our holiday pages for past years do the same automatically rather than disappearing — a page for a date that has been and gone is still useful, and it still links forward to the next occurrence.
Time zones
The countdown uses your device's local date. If you are counting down to an event in another zone, the number of days can differ by one from what someone at the event would see. For anything where that matters, convert the target time with the time zone converter first.
The convention, stated plainly
Today is not counted. A date tomorrow returns 1, a date today returns 0, and the page says the date has arrived rather than showing a countdown to it. This is the ordinary reading of "how many days until", and it is the same rule the rest of the site uses, but it is not universal: a calendar app showing "2 days" may be counting the number of midnights, and a legal deadline may count the triggering day as day one. Where a rule counts today, add one to the figure here.
The count uses your device's local date. That matters more than it sounds for an event in another zone — a launch at 09:00 in Sydney is the previous evening in California, so the two of you are legitimately a day apart on the same countdown. Convert the target with the time zone converter before counting if the difference would change a decision.
Worked example — counting to Christmas
From Tuesday 18 August 2026, Christmas Day on Friday 25 December 2026 is 129 days away — 18 weeks and 3 days. Removing thirty-six weekend days and the Labor Day, Columbus Day, Veterans Day, Thanksgiving and Christmas Day observances leaves 88 working days. If you are planning a project rather than an advent calendar, 88 is the number to plan against, and it is roughly two-thirds of the figure the countdown shows. The gap between the two widens across the autumn, because that is where four of the eleven federal holidays sit.
Where other countdowns disagree
- They count today. An off-by-one on every answer, and the commonest difference between two countdowns to the same date.
- They count in hours and round. A countdown that computes the difference in milliseconds and divides will show a different whole number of days depending on what time of day you look, and will be an hour out for a fortnight after a clock change. This page counts calendar days, so the answer only changes at midnight.
- They use UTC. A countdown built on UTC dates is a day out for anyone west of Greenwich for part of every day.
- They ignore the working week. Most countdowns give calendar days only. For a deadline, the working-day figure is usually the one that decides whether the plan is possible.
Countdowns we keep as their own pages
The dates people ask for most often have a permanent page each, recomputed every morning, with the holiday's own rule written out: Christmas Day, Thanksgiving, Halloween, New Year's Day, Easter and Tax Day among them. The floating ones are the interesting cases: Thanksgiving is the fourth Thursday in November, Easter is the first Sunday after the first ecclesiastical full moon on or after 21 March, and Tax Day moves when it collides with a weekend or with Emancipation Day in the District of Columbia. The full list of countdowns has all of them, and where our holiday dates come from says which are computed and which are estimates.