In December the light is already going by half three, and by four most of it has gone. That makes the clock a steadier guide than the window for anything scheduled in the late afternoon. This page counts down to 3:21 pm exactly, reading straight from the time your own device is keeping.
Coming back to this page in an hour, tomorrow or next month shows exactly the same thing: however long is genuinely left until 3:21 pm 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.
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 3:21 pm using whatever your device is currently set to, so the switch is handled for you.
Common questions
What happens if 3:21 pm 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.
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 3:21 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.
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