The difference between leaving the office at one time and another is measured in queues rather than minutes, particularly heading out of the city. This page tracks the exact time left until 4:20 pm, whether that is when you close the laptop, when you reach the car, or when somebody expects you at the other end.
If 4:20 pm has already gone today, the count simply carries on towards tomorrow's occurrence. That rollover happens by itself at the moment the time passes, with nothing to reset and no need to reload, so a page left open overnight is still showing something useful in the morning.
Airport boards, metro timetables and prayer time tables are all printed in 24-hour form, which is why 16:20 is the version that matters when checking something against a screen or a printed sheet. This page shows 4:20 pm for everyday reading and 16:20 beside it, so the two never need converting in your head.
Common questions
Do the clocks change here?
No. The UAE has no daylight saving at all, so the offset stays at UTC+4 in every month. When the gap to Europe or North America shifts, it is their clocks that moved, not yours.
What is 16:20 on a 12-hour clock?
The same instant is 4:20 pm in writing and twenty past four in the afternoon out loud. Anything from 13:00 onwards loses twelve to give the pm figure, which is the only sum involved in moving between the two.
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 4:20 pm, not a figure worked out when the page first opened.
What happens once 4:20 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.