Lying awake at this hour, the night stretches out with no shape to it at all, and guessing how much of it is left rarely helps. A live count to 4:04 am replaces the guess with a number that moves. Whether 4:04 am is when the alarm goes off or simply when you have given up on sleeping, the figure here is exact.
There is one number to read and nothing to choose: hours, minutes and seconds counting down together towards 4:04 am. No start button, no options, no settings page to get right beforehand — just the current gap to that time, updating on its own for as long as you need 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 4:04 am using whatever your device is currently set to, so the switch is handled for you.
Common questions
What is 04:04 in the 12-hour clock?
That is 4:04 am, or four minutes past four at night 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 4:04 am 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.