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timezone-boundary-builder
A tool to extract data from Open Street Map (OSM) to build the boundaries of the world's timezones.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Awesome Falsehood - A curated list of falsehoods programmers believe in
https://github.com/kdeldycke/awesome-falsehood
I have never had an opportunity to deploy this tool, but here's a program for generating a TZ shapefile from OpenStreetMap data:
https://github.com/evansiroky/timezone-boundary-builder
In principle a calendar program could use its output to perform GIS lookups of locations then use the tzinfo DB to get the correct timezone at the given location and specified time.