In December the light is already going by half three, and by four most of it has gone. That makes the clock a steadier guide than the window for anything scheduled in the late afternoon. This page counts down to 3:18 pm exactly, reading straight from the time your own device is keeping.
The count makes no sound and asks for no attention while it runs. It is a number, not an alarm, and nothing goes off when it reaches zero. Leaving the page open in a background tab is perfectly fine — it will carry on counting towards 3:18 pm whether or not anyone is watching it.
Between the last Sunday in March and the last Sunday in October the country runs on BST rather than GMT, which is why timetables and confirmations sometimes carry the label as well as the number. This page counts down to 3:18 pm using whatever your device is currently set to, so the switch is handled for you.
Common questions
What is 15:18 in the 12-hour clock?
That is 3:18 pm, or eighteen minutes past three 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 3:18 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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