Days Used time-zone boundary data

Download the package (zip, 373,850 bytes)

SHA-256 of the zip: 90b04f99758659aed55c838ef06ed2f8a0b81d7f16bbe6b6dd24d8a66244af74

This download contains the machine-readable time-zone boundary data bundled with Days Used, along with its format decoder and generator sources. Download the file at packages/geo_resolver/assets/time_zones.bin; manifest.json lists the files and their SHA-256 hashes.

© OpenStreetMap contributors. This data is derived from timezone-boundary-builder 2026e, specifically timezones-1970.geojson.zip (SHA-256 3de9301809f44d0ac5ca902b40835d85d9980a35497f0ffda293e98955dc3fb7). The derived data is offered under the Open Database License 1.0. The complete license text is supplied as ODbL-1.0.part1.txt followed immediately by ODbL-1.0.part2.txt.

The generator also uses IANA tzdb zone1970.tab (observed SHA-256 5f23781702bf51408ff1581daa109ab3b9257fb433b1554e579d92172892c0cf; IANA tzdb). It selects zones for countries with multiple offsets in its data window, simplifies rings at 1,000 metres and removes polygons approximately 1 km² or smaller. The decoder documents the little-endian GRB1 representation. See the included generator for the exact algorithm.

The generator expects the unzipped combined-1970.json, zone1970.tab, Dart and the original geo_resolver package context, including its jurisdiction_log dependency and the timezone package. This extract alone is not a dependency-complete standalone build. With those inputs and dependencies available, the original command is:

dart run tool/build_time_zones.dart --geojson /path/to/combined-1970.json --zone1970 /path/to/zone1970.tab

The bundled data is provided as-is. The source files and license texts are included for attribution and examination; reproduction has not been independently verified from this extract.

Files

Each file is also available on its own. manifest.json lists every file with its size and SHA-256 hash (prepared 2026-11-05, source revision 60b1a0e18bceab12840dd78ba2f7969e1a418a69).