Date & Time
Age, duration & timezone calculators
Countdown Calculator
A live countdown — days, hours, minutes and seconds — to a holiday, season, year or custom date, with a days-since count-up mode. Moving holidays are computed, not hardcoded: Western Easter via the Meeus/Jones/Butcher computus and US Thanksgiving as the 4th Thursday of November, so the date is right every year and auto-rolls to the next occurrence once passed. Shows the weekday the event falls on, a weeks-and-days breakdown, and an add-to-calendar (.ics) download. DST-safe UTC math, computed entirely in your browser. Accurate, instant and free — for United States.
What these mean:
Christmas falls on 2026-12-25 (Friday) — 184 days away from 2026-06-24.
Time remaining
184
Days
00
Hours
00
Minutes
00
Seconds
Live timer starts once the page loads in your browser.
Days until
184
Falls on
2026-12-25 — Friday
Weeks & days
26 weeks 2 days
184 total days until Christmas.
Moving holidays are computed, not looked up
How we calculate
How we calculate this
Reviewed by Reckonist Editorial · Last reviewed July 2026. Figures follow the methods and sources set out in our editorial standards.
The live timer counts from your device’s clock; dates use UTC calendar math. Easter is computed via the Meeus/Jones/Butcher computus; other moving holidays via their weekday rules.
Computus · nth-weekday rules
Take it further: find your exact age with the Age Calculator, or the span between any two dates with the Date Difference Calculator.
Days until an event or a custom date
The countdown answers “how many days until [event]” for a built-in holiday, season or year — or for any custom date you enter. It shows the whole-day count, the weekday the date falls on, and a weeks/days breakdown, all on top of a live ticking timer.
Whole days
UTC calendar gap
days = ⌊(target − from) / 86,400,000 ms⌋ on UTC midnights
A day is always a full calendar day, even across a DST change.
Weeks & days
days ÷ 7
weeks = ⌊days / 7⌋ · remainder = days mod 7
Plus the exact weekday the target date lands on.
- 1Whole days: 24 Jun 2026 → 25 Dec 2026 = 184 days.
- 2Weeks & days: 184 ÷ 7 = 26 weeks and 2 days.
- 3Weekday: 25 Dec 2026 is a Friday (UTC weekday).
A live ticking days / hours / minutes / seconds timer
Above the results is a live countdown that ticks every second — days, hours, minutes and seconds down to the target (or up from it in days-since mode). The whole-day figure is computed on UTC midnights; the hours, minutes and seconds are the remainder read from your device clock. It is what a single static “days until” number can’t give you — and the reason to keep the page open.
Runs entirely in your browser
Moving holidays — computed, never hardcoded
Moving holidays are computed so the date is right every year. Western Easter uses the Meeus/Jones/Butcher computus algorithm — Easter 2027 is 28 March 2027. US Thanksgiving is the 4th Thursday of November. Seasons use the equinox/solstice conventions. Because these are rules, not a stale lookup table, the countdown never goes out of date and auto-rolls to the next occurrence once a date passes.
Auto-roll
Days since — the count-up mode
Switch the direction to Days since and the same engine counts upfrom the most recent past occurrence of an event, or from a custom past date — for anniversaries, milestones and “how long since” questions. The weekday, weeks/days breakdown and live timer all work in count-up mode too.
Add the event to your calendar (.ics)
The Add to calendar button downloads a standard .ics file for the resolved target date. Import it into Google Calendar, Apple Calendar, Outlook or any calendar app. The file is generated in your browser from the computed date — no account, no upload.
Frequently asked questions
Christmas is 25 December every year. Counting from 24 June 2026, there are 184 days until Christmas 2026, which falls on a Friday. The calculator shows the whole-day count plus a live timer that adds the exact hours, minutes and seconds, and once the day passes it automatically rolls the countdown forward to the next Christmas.
The days/hours/minutes/seconds figure ticks live from your device clock, refreshing every second. The whole-day count is computed on UTC midnights so a day is always a full calendar day, and the hours/minutes/seconds are the remainder down to the target. The timer runs entirely in your browser — nothing is sent to a server.
They are computed, never hardcoded per year, so the date is correct every year. Easter (Western) uses the Meeus/Jones/Butcher computus algorithm — for example Easter 2027 is 28 March 2027. US Thanksgiving is the 4th Thursday of November. Because these are computed rules rather than a lookup table, the countdown stays accurate indefinitely and auto-rolls to the next occurrence once the date passes.
Yes. Switch the direction to "Days since" and the tool counts up from the most recent past occurrence of the event, or from a custom past date — useful for anniversaries, sobriety counts and "how long since" questions. It is the same engine reversed, so the weekday, weeks/days breakdown and live timer all work in count-up mode too.
The calculator resolves the target date and shows its weekday — for example Christmas 2026 falls on a Friday. Weekday is derived from the UTC calendar date, so it is unaffected by daylight-saving clock changes.
Yes. The "Add to calendar" button downloads a standard .ics file for the resolved target date that you can import into Google Calendar, Apple Calendar, Outlook or any calendar app. The file is generated in your browser from the computed date.
The countdown auto-rolls to the next occurrence. For a fixed holiday like Christmas it moves to next year; for a moving holiday it recomputes the following year with the correct rule. In days-since mode the reverse happens — it counts up from the most recent past occurrence.
Method & references
Methodology: whole days = floor((target − from) / 86,400,000 ms) on UTC midnights; weeks = floor(days / 7). Moving holidays are computed — Western Easter via the Meeus/Jones/Butcher computus, US Thanksgiving as the 4th Thursday of November, seasons via equinox/solstice conventions — and auto-roll to the next (or previous) occurrence once passed. The live days/hours/minutes/seconds timer reads your device clock. All calculations run client-side and nothing is stored.
Cross-links
How we calculate this
Reviewed by Reckonist Editorial · Last reviewed July 2026. Figures follow the methods and sources set out in our editorial standards.
The live timer counts from your device’s clock; dates use UTC calendar math. Easter is computed via the Meeus/Jones/Butcher computus; other moving holidays via their weekday rules.
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Same-category tools follow this colour; a cross-category link keeps its own.