A rain delay is recorded as precisely as a scoreline. The timestamps matter operationally long before anyone cares about them historically.
The clock stops in several places at once
When play is suspended, the chair umpire logs the time, the referee's office logs it, and court operations log it for the ground staff.
Multiple logs exist because the parties need different things. The umpire needs match duration, the referee needs scheduling impact, operations needs court downtime.
Reconciling them afterward is routine but not automatic, which is one reason published stoppage times occasionally differ from internal records.
Resumption is a scheduling decision
Restarting requires the court to be playable, which on grass means covered promptly and dried adequately, and requires the players to have had a stated warm-up period.
The referee's office works from covering and uncovering times to estimate readiness, so the log is an input to the decision rather than a record of it.
Cascading effects across other courts are calculated from the same timestamps, since a delay on one court moves everything scheduled behind it.
The roof changed the log, not the need for it
A roofed court can continue when others cannot, which creates its own logging requirement: closure time, the interval to playable conditions, and the change in playing conditions.
Closure is not instantaneous and the environment beneath a closed roof differs from open air, so the transition is treated as a recorded change in conditions.
Matches that begin outdoors and finish under a roof are therefore played in two distinct conditions, and the log is what allows that to be identified afterward.
Why duration figures depend on this
A published match duration either includes stoppages or excludes them, and only the timestamp log makes the second version computable.
Because conventions differ, a long match interrupted by rain can be reported with substantially different durations by different sources, both correctly.
The timestamps are the reason the disagreement is resolvable at all. Without them, no source could produce the excluded-stoppage figure.
The archive that results
Years of stoppage logs constitute a detailed record of when a tournament loses playing time and how long recovery takes.
That informs capital decisions about covers, drainage and roofing, which are expensive and are justified against measured downtime rather than impressions.
A record kept for the referee's office each afternoon becomes, over decades, the evidence base for how the venue is built.

