School gates open at half three in most of the country, and the pavement outside fills up in the ten minutes before. Getting there without either sprinting or standing about for twenty minutes is a matter of leaving at the right moment. This page counts down to 5:02 pm exactly, second by second.
Because the count reads straight from your device's clock, its accuracy rests on that clock being right, time zone included. Phones and computers normally handle this themselves, so in practice the figure here lines up with whatever time the device is already showing elsewhere on screen.
Matching what somebody said against what somebody wrote is easier with all three versions to hand: 5:02 pm for everyday reading, 17:02 for anything printed in railway style, and two minutes past five in the evening 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
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 17:02 in the 12-hour clock?
That is 5:02 pm, or two minutes past five in the evening 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.
What happens if 5:02 pm has already gone for today?
The count simply carries on towards the next occurrence, which is tomorrow. That rollover happens on its own — the page does not need reloading and there is nothing to reset by hand.