ZoneSync Meeting Planner

Time zone converter and meeting planner with exact daylight saving time handling.

ZoneSync converts a date and time between cities and time zones using the full IANA time zone database, so daylight saving time is always right: including the weeks in March and October/November when the US and Europe are out of step, half-hour and 45-minute zones such as India and Nepal, and clock changes that make a local time skipped or repeated. Its meeting planner ranks meeting slots for 2-8 places by how many people are inside working hours, shows a 24-hour timeline per place, and gives a calendar (.ics) file for the slot you pick.

What it does

Convert a time from one place to up to 20 others, with UTC offset, abbreviation, and +1/-1 day markers
Exact daylight saving time: skipped times (spring forward) are explained and shifted; repeated times (fall back) show both instants
Warns when a clock change happens within 7 days, and when two places are temporarily 1 hour closer or further apart than usual
Meeting planner for 2-8 places over up to 14 days with per-person working hours and work weeks; shows each slot's flexible start window and the closest time that works for everyone
24-hour timeline per place with working hours shaded and the top-ranked slots highlighted
Calendar file (.ics) for any chosen slot, in UTC so every calendar app shows the right local time
Understands about 500 cities, US states, countries, IANA zones, UTC offsets, and common abbreviations (PST, CET, IST...)

Try asking ChatGPT

“Convert 3pm PST on Nov 3 to Warsaw and Sydney time, DST included”

“Find a 1-hour meeting slot for New York, London and Bangalore on 2026-11-10”

“Show the working-hour overlap for my team in Berlin, Austin and Sao Paulo, Nov 9-13, 2026”

Limitations

Uses the time zone rules built into the server (IANA database); rule changes announced after its last update are not reflected
Does not read or write your calendar, check anyone's availability, or send invitations
Public holidays are not considered when ranking meeting slots
Place lookup covers about 500 cities plus states, countries, and any IANA zone; smaller towns need a state or country ("Springfield, Illinois")

Connect

Install ZoneSync Meeting Planner from the ChatGPT plugin directory. Developers can connect the MCP endpoint directly: https://meeting-planner.zovo.one/mcp