Reference

Tables rather than explanations. Every figure on these pages is computed from the IANA time-zone database when the site is built, and every page says which release it was computed from.

• Daylight saving time by zone, 2026

  All 312 zones the database lists separately, sorted into the 107 that change their clocks this year, those that have stopped and the year each of them stopped, and those that never have since 1970.

• Time-zone edge cases

  68 cases where converting a time is not the arithmetic people expect — the hour that never happened, the hour that happened twice, the forty-five-minute offset — each with the zone, the instant and the expected result. The corpus this site's own logic is tested against, published under CC0.

These pages carry no JavaScript. For the tools, see the converter and the meeting planner; for the explanation behind the tables, why the time difference between two cities changes.