Deciding to be asleep by a set time and actually managing it are two different problems, but the first is easier with a real number attached to it. A precise count to 10:58 pm removes the comfortable margin people invent for themselves at this hour, and it keeps removing it every second the page stays open.
One number, counting down: hours, minutes and seconds together. No button to press first, no options to get right, no settings screen hiding a default that turns out to be wrong. Whatever it says is the current distance to 10:58 pm, worked out fresh a second ago rather than when the page loaded.
In an office where a dozen nationalities read the same calendar invite, 24-hour notation quietly does a lot of work. 22:58 cannot be misread as the other end of the day, whereas 10:58 pm depends on the reader noticing two small letters at the end of it. Both describe exactly the same moment.
Common questions
Does the number update by itself?
Yes. It is recalculated every second from your device's clock, so nothing needs refreshing or restarting. Whatever is on screen is the current gap to 10:58 pm, not a figure worked out when the page first opened.
What happens once 10:58 pm has passed for today?
The count rolls over and carries on towards the same time tomorrow. That happens on its own at the moment the time passes — the page does not need reloading and there is nothing to reset by hand.
Which clock does the countdown use?
Your own. It reads the local time and time zone from the device in front of you, which in the Emirates means Gulf Standard Time, UTC+4. Travel and the count follows whatever the device picks up.
Will it alert me when 10:58 pm arrives?
No. This is a live figure rather than an alarm — nothing sounds, vibrates or notifies at zero. If you need interrupting at 10:58 pm, set an alarm alongside it and use this page as the running total.