Day Counter

Calculate the difference between two dates, count down to an upcoming event, or measure how much time has elapsed.

即座に結果表示 ブラウザで動作 Live updates

Upcoming Days

How Is It Calculated?

Days = End Date − Start Date

Calculation is done in millisecond precision and updates based on your browser's time zone.

使い方は？

  1. 1
    Select a DateChoose the Countdown or Elapsed Time tab, then enter your target date.
  2. 2
    StartClick 'Start Counting'; the counter begins ticking instantly.
  3. 3
    View ResultsSummary cards show days, weeks, months, and hours — copy them with one click.

よくある質問

Does the countdown update in real time?
Yes, the counter refreshes automatically every second.
Does it work for dates in the past?
Yes; if you select a past date, the counter shows how much time has elapsed since then and displays a note.
Can I save the results?
Use the Copy button to copy results to your clipboard, or use the print button.

What Is a Day Counter?

A day counter is a free online tool that calculates the difference between two dates in days, weeks, months, and hours. You can count down to an upcoming event or instantly find out how many days have passed since a specific date.

Countdown Feature

In the Countdown tab, set a target date and optionally add an event name. Click 'Start Counting' and a live clock displays the remaining days, hours, minutes, and seconds, ticking every second. Summary cards also show total days, total weeks, total months, and total hours remaining.

Elapsed Time Calculation

In the Elapsed Time tab, enter a start date and click 'Calculate.' The tool automatically computes how many days, weeks, months, years, and hours have passed since that date. Past dates are handled correctly as well.

Upcoming Special Days

The right-hand sidebar automatically lists how many days remain until universal events like New Year's Day, the Spring Equinox, Labour Day, the Summer Solstice, the Autumn Equinox, Christmas, and the Winter Solstice.

How Is the Day Difference Calculated?

The calculation is straightforward: the start date is subtracted from the end date, and the resulting millisecond value is divided by 86,400,000 to get the number of days. The tool performs this in millisecond precision and stays current based on your browser's time zone.

Who Is It Useful For?

The day counter is ideal for anyone tracking important events such as weddings, birthdays, exams, vacations, or project deadlines. Students can track days until an exam, professionals can monitor project due dates, and new parents can see how many days have passed since a baby's birth.

Runs in the Browser — No Installation Required

NtoolBox's day counter runs entirely in your browser; no app download or account creation is needed. Your data stays on your device and is never sent to a server. Works seamlessly on desktop, tablet, and mobile devices.

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