The Tube at this hour is a matter of joining the right crowd rather than choosing a seat, and getting through it depends on leaving at a specific minute. This page counts down to 6:36 am precisely — the moment to leave, the moment to touch in, or the moment a meeting on the other side begins.
Coming back to this page in an hour, tomorrow or next month shows exactly the same thing: however long is genuinely left until 6:36 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 06:36 may well be the figure staring back at you even though 6:36 am is how the same moment would be said aloud. Neither is more correct than the other.
Common questions
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 6:36 am, 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 06:36 in the 12-hour clock?
That is 6:36 am, or twenty-four minutes to seven 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.