A better Java library for determining Olson TZ Database time zones from latitude and longitude.

Existing Java implementations of timezone lookup (that we could find) were either inefficient (i.e., not indexed) or not packaged for reproducable builds, updates, and consumption. The goal of this project is to provide an efficient Java timezone lookup using standard Java tools and techniques.

Currently, the tool loads and indexes the tz_world shapefiles on initialization. It uses Geotools for shapefile handling and JTS for spatial indexing with their Sort-Tile-Recursive R-Tree implementation.

The tz_world data is limited to only timezones on land. We'd like to add territorial waters, but we need shapes first.

• Improved documentation and examples
• Added test coverage and configuration for automated CI
• Publication to Maven Central