Methodology
How Clockjumper sources and verifies what it publishes — time-zone data, event schedules, and original research.
Time-zone data and event schedules
Offsets, DST transitions, and abbreviations come from the IANA tz database and are computed at render time. Event schedules carry a four-state verification status and are checked against named official sources. Both are described in full in our editorial policy.
Research
Each research series publishes its own methodology — the city-selection gates, computation, regime map, and known limitations:
Corrections
Substantive fixes are logged with a date on the corrections page.