Alarm by specifying the date and time

Alarm size
Millisecond display
Date format
Sound effect

How to use the alarm

Just set the date and time and click Set to set the alarm.

It is a convenient tool that can be used on the web and can measure even while the browser is closed.

Alarm time setting

Select the alarm date, "hours", "minutes" and "seconds" and click the "Set" button to set the selected time.
Click the "Current time" button to select the current time.

Click the "Set" button to set the alarm and start the countdown until the end time.

Timer reset

Click the "Reset" button to stop the countdown.


Alarm information is saved in the browser, so the end time is saved even if the browser is closed during the countdown.
When you open the same page again, the countdown will continue as it is if there is time left.If the set time has passed, the elapsed time will be counted up.

If the countdown time reaches 0 seconds while the browser is closed, no message will be displayed.


Timer size

You can change the font size of the timer by moving the slider.

Millisecond display

Change to "Show" to display milliseconds.In the case of "Hide", it will display up to the second.

Date format

The time notation method can be selected from "1/1/2023" and "January 1, 2023" notation.


You can choose whether or not to display a message when the countdown is over.

Sound effect

You can choose whether or not to play a sound effect when the countdown ends.

Save settings

The date, hour, minute, and second selected and set, time notation, stop settings, etc. are saved in the browser.
Even if you close the browser once, you can easily start the countdown again with the same settings.