IANA Time Zone Database
The bundled rule source is IANA Time Zone Database version 2026f, released on 28 October 2026. The package retains the downloaded source archive, its checksum, the resulting transition-data checksum, and the data license. Runtime calculations use the bundled data rather than a live lookup service or the browser’s potentially different time-zone database.
City labels and IANA identifiers
The curated directory contains 32 city labels. Each points to an explicit IANA identifier; supported aliases resolve to the same entity rather than a duplicate page. Mumbai and New Delhi use Asia/Kolkata. Shanghai and Beijing use Asia/Shanghai. The zone name is a rule identifier, not a claim that every meeting takes place in the identifier’s named city.
Dated examples and supported years
The city and zone tables use selected dates in 2026. The core eight-city example starts at 13:00 UTC on 27 October 2026. They are stored examples, not live clocks. The supported planning years are 2026–2035, and later government decisions may require a new rule-data release.
Official explanations of clock changes
The UK and US explanatory guides link to GOV.UK and NIST where they discuss those jurisdictions’ clock-change dates and rules. These references help explain the examples. The actual multi-zone computation uses the pinned IANA rule data, including locations outside those jurisdictions.
Calendar interoperability
Calendar downloads use the iCalendar format specified by RFC 5545. Each reviewed event has an unambiguous UTC start and end. Recurring previews are exported as individual events. Import the file into your chosen calendar and inspect the count, duration, and dates around any change.
Fonts and other distributed assets
The English interface and timetable use a locally bundled Inter font by Rasmus Andersson under the SIL Open Font License. The source package includes the license, upstream location, and a hash of the actual file. An additional Noto Sans Arabic font is retained for isolated language-extension verification; it does not create a public second-language site.
No implied authority or endorsement
References identify data and standards. They do not mean that IANA, a government agency, a calendar vendor, or a font author operates or endorses HourBraid. The product’s editable working-hour examples are authored planning scenarios, not facts supplied by those sources.