Appointments at the surgery or the dentist are rarely worth arriving late for, and the useful figure is not the appointment itself but how long is left before you have to set off. Set that in your head as 6:24 am and this page will count down to it, exact to the second, for as long as it stays open.
There is one number to read and nothing to choose: hours, minutes and seconds counting down together towards 6:24 am. No start button, no options, no settings page to get right beforehand — just the current gap to that time, updating on its own for as long as you need it.
Writing a time as 6:24 am 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 06:24 is less conversational and considerably harder to misread, which is why schedules and rotas lean that way.
Common questions
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.
What happens if 6:24 am 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 6:24 am, set an alarm as well and treat this page as the running total.