TZ History Every time zone change, ever made, explained

Map Zones Countries Years Offsets DST Rankings Calculator Notes Releases News Blog

tzdb Release 2009h

Release version: 2009h

Publication timestamp: 2009-05-26 09:19:14 -0400

Summary: [not summarized]

Advertisement Space

Changelog (from NEWS)

[not summarized]

Sources and Attribution: Time zone transitions, maintainer commentary, and release histories are derived from the public-domain IANA Time Zone Database. Geographic boundary polygons are derived from timezone-boundary-builder and OpenStreetMap contributors under the Open Database License (ODbL). Country outlines and graticules are from Natural Earth (public domain). Country names are strictly derived from iso3166.tab.

Methodology Sources & Licenses About Privacy Policy API Documentation Leap Seconds Sitemap

© 2026 TZ History. Plain language, public-data time zone reference.

We use minimal cookies for aggregate analytics and ad performance. We default to privacy-preserving Consent Mode v2 (denied) until you choose to accept.