Countdown to Date

Days, hours, minutes, seconds remaining until a target date.

Inputs

Result

Loading calculator…
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General calculation reads

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How Not to Be Wrong
Jordan Ellenberg - math thinking
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The Joy of X
Steven Strogatz - accessible math
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Scientific calculator (Casio fx-991EX)
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How to use this calculator

  • Set target date.
  • Set "as of" to today.
  • Read remaining time.

About this calculator

Days/hours/minutes/seconds until a future date. Pure date arithmetic (compute() must be pure for SSR), so the "now" is taken from the as-of input rather than a real clock — change as-of to today's date to get a current countdown.

Frequently asked

Why use as-of instead of "now"?+
compute() must be pure (SSR-safe). Live "now" would change on every render. The user provides today's date as input; the page is then rebuildable and cacheable.
Can I count down to a time, not just a date?+
Not in this calculator — date precision only. For sub-day precision, use a JavaScript-based countdown widget.
Will the count update?+
Only when "as of" is changed. The page doesn't auto-refresh.
Can I countdown multiple dates?+
Run the calculator multiple times with different targets.
How many seconds in a year?+
Average year (365.25 days) = 31,557,600 seconds. Common year (365 days) = 31,536,000.

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