Skip to main content

Countdown Timer

Whether you're counting down to a vacation, a product launch, a deadline, or a birthday — our countdown timer shows the exact time remaining in days, hours, minutes, and seconds, updates in real-time, and lets you share the countdown link with others. It also handles past events to show elapsed time.

Days

Hours

Minutes

Seconds

Share this tool
Date & Time

About the Countdown Timer

Whether you're counting down to a vacation, a product launch, a deadline, or a birthday — our countdown timer shows the exact time remaining in days, hours, minutes, and seconds, updates in real-time, and lets you share the countdown link with others. It also handles past events to show elapsed time.

How to use it

  1. Enter the target date and time (and timezone for international events).
  2. See the live countdown in days, hours, minutes, and seconds.
  3. Add a title and customize the display for sharing.
  4. Copy the shareable link — anyone opening it sees the same countdown in their local timezone.

Formula & methodology

Remaining time = target datetime − current datetime (in milliseconds). Days = floor(ms / 86400000). Hours = floor((ms % 86400000) / 3600000). Minutes = floor((ms % 3600000) / 60000). Seconds = floor((ms % 60000) / 1000). Updates every 1000ms via setInterval(). Timezone: convert both to UTC for subtraction.

Common use cases

  • Product launches and public announcements ("launching in X days")
  • Event marketing: countdown to conference, sale, or limited-time offer
  • Personal: vacation countdown, birthday or anniversary
  • Project management: days until deadline, sprint end, or release date
  • Sports: countdown to game day or season opener

Frequently asked questions

The safest approach is to store both the target time as UTC and the intended local timezone, then display the countdown relative to UTC. If the countdown crosses a DST transition, the UTC offset of the timezone changes, but the UTC target remains fixed — so the local time display adjusts accordingly. Our tool handles DST automatically using the IANA timezone database.
The display switches from countdown to "Event started!" and can optionally switch to counting up (elapsed time since the event). For recurring events (e.g., "next New Year"), you can set it to auto-reset to the next occurrence. For sales or offers with a hard deadline, the tool can show a "closed" state after zero to prevent late submissions.

Related tools

Age Calculator Age Difference Calculator Date Difference Calculator Day of Week Calculator Days Until Date Moon Phase Calculator

Related tools

All Tools →
Date & Time

Moon Phase Calculator
Date & Time

Pomodoro Timer
Date & Time

Age Calculator
Date & Time

Weeks Between Dates
Date & Time

Stopwatch
Date & Time

Date Difference Calculator

Embed this tool on your site

Free for personal and commercial use. Just copy the snippet below.