Getting the metro is really a question of leaving the building at the right minute, since the walk to the station is the part that varies from one day to the next. This page counts down to 6:31 am exactly — the moment to head out, the moment to tap in, or the moment something starts at the other end.
There is nothing to start and nothing to choose. The page reads the clock on your device, works out the gap to 6:31 am, and redraws it every second for as long as it is open. Leave it in a background tab if you like; the number will be current whenever you look back at it.
The Emirates keep Gulf Standard Time, UTC+4, and never move the clocks. Everything about time here follows from that: 6:31 am in January is the same 6:31 am in July, and the gap to London or Berlin changes twice a year because of what they do, not because of anything happening at this end.
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 06:31 on a 12-hour clock?
The same instant is 6:31 am in writing and twenty-nine minutes to seven in the morning 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 6:31 am, not a figure worked out when the page first opened.
What happens once 6:31 am 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.