Night shifts commonly start somewhere in this stretch, well after the rest of the house has settled for the evening. If 6:08 pm is clock-on time, the last hour before it tends to drag more than the shift itself. A live countdown at least keeps that hour honest, tracking the exact time left.
Nothing is downloaded, nothing is registered, and nothing is left on the device afterwards. The whole count runs inside the page you already have open. Closing it costs nothing at all, and opening it again later simply shows the accurate gap to 6:08 pm as it stands at that moment.
Plenty of phones, laptops and dashboards default to a 24-hour display regardless of how people around here actually talk, so 18:08 may well be the figure staring back at you even though 6:08 pm is how the same moment would be said aloud. Neither is more correct than the other.
Common questions
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.
Will this alert me when the time arrives?
No. It is a live number rather than an alarm — nothing rings, buzzes or notifies you at zero. If you need to be interrupted at 6:08 pm, set an alarm as well and treat this page as the running total.
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 18:08 in the 12-hour clock?
That is 6:08 pm, or eight minutes past six 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.