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Historical clock change

Chatham TV guide clock change on 06 April 2025

The local time 03:15 on 06 April 2025 is repeated in Pacific/Chatham. Use an explicit offset when mapping the affected programme.

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The local time 03:15 on 06 April 2025 is repeated in Pacific/Chatham. Use an explicit offset when mapping the affected programme.

What the time zone rules produce

Historical IANA example for Pacific/Chatham with a 60-minute wall-clock change.
MomentLocal schedule timeUTC
One second before the change2025-04-06 03:44:59 +13452025-04-05 13:59:59 UTC
At the change2025-04-06 02:45:00 +12452025-04-05 14:00:00 UTC

The same wall time refers to two instants

Both examples show 03:15 in Pacific/Chatham on the named date.
Explicit XMLTV-style startCorresponding UTC
20250406031500 +13452025-04-05 13:30:00 UTC
20250406031500 +12452025-04-05 14:30:00 UTC

If the EPG shows the wrong slot

Keep the original offset or UTC instant to determine which showing the source means. A global offset would move unrelated programmes.

Sources and further reading