* [spacetime 7.16.0](https://github.com/spencermountain/spacetime) – Lightweight date calculator for handling timezones and date-related operations.

* [Carbon v2.6.18](https://github.com/dromara/carbon) – Developer-friendly time package for Golang with semantic features.

* [node-geo-tz v8.1.10](https://github.com/evansiroky/node-geo-tz) – Node.js package for accurate geographical timezone lookup based on GPS coordinates.

* [TZF v2.1.2](https://github.com/ringsaturn/tzf) – Fast Go library to find timezones from latitude and longitude.

* [Timezone Boundary Builder 2026e](https://github.com/evansiroky/timezone-boundary-builder) – Tool that extracts OpenStreetMap data to build worldwide timezone boundary shapefiles.