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Time zone overlap map
Not a map of the world — a map of the day. Each row is one zone's clock across your day, midnight to midnight, on a shared timeline, so night steps across the rows the way a terminator sweeps a globe, and the hours when everyone is at work are the ones worth booking.
where this comes from
It is one function out of a calendar.
This page runs the zone layer from kloq — zoneOffsetMinutes(), zoneAbbr() and formatInZone() — the same code that ships in kloq, not a re-implementation. Every interaction in the calendar is built to this standard, which is the whole pitch.