Count down to a date and time, or for a duration you set. Free, and it keeps the right time across a refresh or a change of date.
The countdown counts down to a moment. You give it that moment in one of two ways. A duration adds the minutes you enter to the current clock reading. A date and time is read as a wall-clock time in your device's own time zone, and turned into the moment it stands for.
Either way one moment is stored, and the display is one subtraction:
remaining = target moment - current time
The page reads the clock four times a second to refresh the display. No running total is kept, so a slow refresh, a reload or a suspended tab cannot make the countdown drift. It shows the time that has really passed, not the time the page was on screen for.
A target that is not in the future is refused, with the message "Choose a future date or a duration of at least one minute."
The display counts hours, minutes and seconds. It has no field for days, so a long countdown is shown as a large number of hours.
Enter 90 minutes and press Start countdown. The display reads 01:30:00, and the target line below the buttons shows the date and the clock time 90 minutes ahead.
Switch to another tab and come back after 70 minutes. The display reads 00:20:00. A background tab is refreshed less often, and none of that matters, because the remaining time is worked out from the clock.
Pick a date and time 144 days ahead and press Start countdown. The display reads 3456:00:00, because 144 days is 3456 hours. It does not read 144 days. To read the display in days, divide the hours by 24.
No. It shows 00:00:00 and the status reads Done, and nothing plays. Only the Timer sounds a tone, and it does so once, when its own duration runs out. Use the timer if you need to be told rather than to look.
The display has three fields: hours, minutes and seconds. The hours field is not capped at 24, so a target a year away reads 8760:00:00. Nothing is lost, and the seconds stay readable, which is what a countdown is usually watched for at the end.
Your device's own. The date and time you pick is treated as the clock time where you are, and the browser turns it into a moment using your zone's rules. To count down to a time given in another country, work out what that time is where you are with the Time Zone Converter, then enter that.
The duration field takes up to 525600 minutes, which is 365 days. The date field takes any date and time in the future.
A reload picks the countdown up where it stands, because the target is a fixed moment rather than a number counting down: the page subtracts the current time from it and shows the correct figure. Nothing runs while the tab is closed, and nothing needs to.
Closing the tab clears the target. It is held for the browser session only, like everything else Toolbox keeps. Enter the date again and the countdown reads the same, because the moment did not move.
No. The target stays in your browser. There is no account, and the countdown works with no internet connection once the application is stored after your first visit.
Because the target is a moment rather than a count of hours, a daylight-saving change between now and then is handled for you. Pick 09:00 on a date on the other side of a clock change in your zone, and the countdown still ends at 09:00 on that date. The browser worked the moment out from your zone's own rules, and the hours in between are simply one hour more or one hour fewer.
The countdown reads the clock that reports the date and time, not a counter that only goes forward. That is the right clock for this job. The answer to "how long until Friday at 09:00" depends on today's date, so a wrong device clock gives a wrong countdown.