Tea time in a house with children is less a meal than a schedule, with everything before it timed to land in the right order. If 4:09 pm is when it needs to be on the table, the countdown here is more use than an estimate, updating continuously as the afternoon runs down.
Nothing is downloaded, nothing is registered, and nothing is left on the device afterwards. The whole count runs inside the page you already have open. Closing it costs nothing at all, and opening it again later simply shows the accurate gap to 4:09 pm as it stands at that moment.
Matching what somebody said against what somebody wrote is easier with all three versions to hand: 4:09 pm for everyday reading, 16:09 for anything printed in railway style, and nine minutes past four in the afternoon for whatever was actually spoken down the phone. All three describe precisely the same point in the day, and having them side by side saves a good deal of squinting at a timetable.
Common questions
Will this alert me when the time arrives?
No. It is a live number rather than an alarm — nothing rings, buzzes or notifies you at zero. If you need to be interrupted at 4:09 pm, set an alarm as well and treat this page as the running total.
Is it affected by the clocks changing?
Only in the sense that your device is. When the change between GMT and BST happens at the end of March and October, the device adjusts and the countdown follows it without anything to do here.
What is 16:09 in the 12-hour clock?
That is 4:09 pm, or nine minutes past four in the afternoon if you are saying it aloud. From 13:00 onwards, subtracting twelve gives the pm figure — the same moment written three different ways.
Does the number update by itself?
Yes. It recalculates every second from your device's clock, so there is nothing to refresh or restart. Whatever is on screen is the current gap to the target time, not a figure worked out when the page first loaded.