Evening classes, choir practice and rehearsals all begin whether or not you have arrived, and the journey is usually the part that gets underestimated. This page counts down to 9:18 pm exactly, so the decision about when to leave rests on a number rather than on optimism.
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 9:18 pm whether or not anyone is watching it.
Rail and bus timetables across Britain are printed in 24-hour time, which is why 21:18 is the version that matters when checking a departure against a board or a printed sheet. This page shows 9:18 pm for everyday reading and 21:18 alongside it, so the two can be matched without any mental arithmetic.
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 9:18 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 21:18 in the 12-hour clock?
That is 9:18 pm, or eighteen minutes past nine 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.
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