How long until 10:21 pm?

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Countdown to 10:21 pm according to your device's time.

 
 

An episode that ends around 10:21 pm tends to be followed by another one, which is roughly how a reasonable night becomes a short one. Seeing the exact time remaining, ticking down rather than sitting still, makes that decision a conscious one instead of something that just happens.

Coming back to this page in an hour, tomorrow or next month shows exactly the same thing: however long is genuinely left until 10:21 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.

Writing a time as 10:21 pm keeps the am or pm attached, which reads naturally in a sentence but is easy to skim past in a long list of similar entries. Writing it as 22:21 is less conversational and considerably harder to misread, which is why schedules and rotas lean that way.

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 10:21 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.

What is 22:21 in the 12-hour clock?

That is 10:21 pm, or twenty-one minutes past ten 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.