Event Countdown Calculator
Create a live countdown to any event date and time, with days, hours, minutes, seconds and shareable copy.
The countdown uses your device's local time. If your time zone or system clock changes, the result recalculates.
Weeks, months and years are scale estimates: one month is treated as 30.44 days and one year as 365.25 days.
Countdown to any event date
Event countdown intent is simple and personal: enter an event name, date and optional time, then keep a live countdown in days, hours, minutes and seconds.
T_event is the selected local event instant and T_now is the current browser time.
Countdown behavior
- Preset events use common English-language holidays and occasions.
- Custom events can use any name, date and local time.
- The live countdown updates while the page is open.
- Past events show how long ago the selected date occurred.
Frequently Asked Questions
Sources and References
- DateMDN Web Docs
- Representing dates and timesMDN Web Docs
- Gregorian calendarBritannica
- ISO 8601 date and time formatISO
- International System of Units: TimeNIST
Calculations are based on the listed reference sources. Links open in a new tab.
Related Tools
Count how many calendar days are left until an event or how many days have passed since it, with weeks, months, weekday and rough weekday totals.
Calculate the date difference between two dates or add and subtract calendar days from a start date, with full calendar breakdowns.
Calculate how much time has passed since a date and time, with live years, months, days, hours, minutes and seconds.
Find the calendar date a number of days ago or days from a chosen date, with weekday and exact date output.