Courts and pitches are booked by the hour and the hour begins whether or not you have arrived, with the drive across town being the part that gets underestimated. This page counts down to 7:21 pm exactly, so the decision about when to leave rests on a number rather than on optimism about the traffic.
There is nothing to start and nothing to choose. The page reads the clock on your device, works out the gap to 7:21 pm, 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.
India runs half an hour off the round numbers, thirty minutes ahead of the Emirates, which catches out anyone arranging a call by counting whole hours. Since the clocks here never shift, the offset to Mumbai is fixed all year — it is the European and American ones that move underneath you.
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 7:21 pm, not a figure worked out when the page first opened.
What happens once 7:21 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 7:21 pm arrives?
No. This is a live figure rather than an alarm — nothing sounds, vibrates or notifies at zero. If you need interrupting at 7:21 pm, set an alarm alongside it and use this page as the running total.