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World time zone boundaries

Explore 419 named IANA time zone areas on a world map. Compare time zone boundaries and add your own notes.

Time zone boundary builder contributors and OpenStreetMap contributors. Derived data under ODbL 1.0.

About this dataset

  • Each area has an IANA time zone identifier. The map uses the complete timezones land-boundary release.
  • Use the areas to compare time zone coverage and add notes to a world map.
  • Boundaries are simplified with a tolerance of 0.02 degrees. Small boundary details can be omitted.
  • The source release is 2026c, published 2026-07-11. This map was prepared on 15 September 2026.
  • UTC offsets depend on the date and daylight saving rules. This layer does not supply a current UTC offset.
  • The areas are approximate time zone boundaries. They are not legal boundary evidence.
  • The standard map view ends near 85 degrees north and south. The download retains all source coordinates, including polar areas.

Source and licence

Time zone boundary builder

Licence: ODbL 1.0

GeoJSON download details

The download includes all 419 features as area groups, areas. Coordinates use longitude and latitude in WGS84.

The preparation date is when we prepared this dataset. Read the source notes for the dates covered by the data.

GeoJSON fields 3
name
IANA time zone identifier used as the area label.
tzid
IANA time zone identifier.
source_url
IANA time zone database information.