A rugby union half can continue after the displayed regulation time has expired because the laws define when the period ends within the live sequence. A clock turning red is a warning about time, not always an immediate whistle. Follow possession, the referee and the next dead-ball situation rather than assuming the programme must stop at the displayed minute.

Read the half and match format
The timing framework depends on the competition and version of rugby. A senior fifteen-a-side union match and a sevens match do not have the same period length. Confirm the event label first. The television clock represents the match's time administration, including any official stoppage treatment. If a replay shows the clock changing or being corrected, use the referee's administration rather than treating the graphic as an independent authority.
Watch the live sequence after expiry
The ball can remain in play while the clock shows the period's time has elapsed. A team may continue attacking, and a defending side may seek a lawful way to end the passage. The exact exceptions and restart consequences belong to the current law. A penalty, scrum or other ruling can affect what follows. Do not reduce the rule to a universal statement that any ball out instantly ends every half. Listen to the referee and observe the announced restart.
Keep time pressure linked to the score
A side protecting a lead has a different objective from one needing a try. The clock alone does not explain the choices. Read the margin and possession alongside it. A long final passage can involve several phases without a score, but each possession decision still matters. Viewers can describe the visible risk without assuming the players know an exact wall-clock finish. The competition follows the law's ending procedure, not a television schedule estimate.
Allow room for the actual finish
A programme guide's ending time is not a guarantee that the last phase will be over. Reviews, injuries, stoppages and any permitted continuation can add real time. If you plan another event afterward, leave a margin or choose a legitimate replay route through the actual service. For a useful learning exercise, note what finally ends one half and compare it with the clock's earlier expiry. That makes the difference between time elapsed and period completed concrete without inventing a rule for every possible edge case.
Useful answers
Does a red clock always mean play must stop immediately?
No. The law defines the end of the period within the actual sequence. Follow the referee and the relevant restart provisions.
Can a rugby union timing guide be applied unchanged to sevens?
No. The format has different timing provisions. Identify the competition and use its current rules.