A meeting booked for just after lunch is the one most likely to catch someone out, because the morning overruns and nothing interrupts the drift. This page counts down to 1:21 pm exactly, updating continuously, which is more reliable than a mental note to check back in a bit.
Rather than rounding to the nearest minute, the count tracks hours, minutes and seconds the whole way down, in one line. That precision matters most in the last stretch, when the minutes turn into single figures and the difference between leaving now and leaving shortly stops being academic and starts costing you the train.
Matching what somebody said against what somebody wrote is easier with all three versions to hand: 1:21 pm for everyday reading, 13:21 for anything printed in railway style, and twenty-one minutes past one 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
What is 13:21 in the 12-hour clock?
That is 1:21 pm, or twenty-one minutes past one 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.
What happens if 1:21 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.
Which clock does it use?
Your own. It reads the local time and time zone from the device you are looking at, so the figure reflects where you actually are rather than a fixed zone written into the page.
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