Timezone Boundaries Mapped

The IANA timezone database contains over 400 timezone entries mostly named as “<continent>/<city>”. They are meticulously cataloged to group regions of the world not only by UTC offset but also by the presence and timing of Daylight Savings as well as current and historical timezone policy changes. The github.com/albertyw/localtimezone repository maps latitude/longitude data to IANA timezone names. It is based on github.com/evansiroky/timezone-boundary-builder which in term is based on OpenStreetMap. From that data, I generated an Interactive Map:

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