First trains, night buses and the early crossings all leave before most alarms have gone off, and a few minutes either way decides whether you make one. This page counts down to 5:20 am exactly, which is more use than glancing at a phone and rounding the answer to the nearest ten minutes.
Coming back to this page in an hour, tomorrow or next month shows exactly the same thing: however long is genuinely left until 5:20 am next comes round. There is no session to lose and nothing to configure again, because the number is worked out fresh each time from the clock on your device.
Plenty of phones, laptops and dashboards default to a 24-hour display regardless of how people around here actually talk, so 05:20 may well be the figure staring back at you even though 5:20 am is how the same moment would be said aloud. Neither is more correct than the other.
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 05:20 in the 12-hour clock?
That is 5:20 am, or twenty past five in the morning 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 5:20 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.