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Practical guide · reviewed 2026-07-29

Prevent DST from moving your international meeting

Recurring meetings can shift for some participants when countries enter or leave daylight saving time on different dates. Use named IANA zones, test the actual date and warn attendees before the transition.

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UTC reference

Use city zones

Choose Europe/London or America/New_York instead of a fixed label such as GMT or EST when the meeting must follow local civil time.

Review transitions

Check the weeks around March, April, October and November, but rely on the named zone rather than a generic seasonal rule.

Share one instant

Send an event link or calendar file that stores the UTC instant and named zone so every attendee sees the correct local time.

Pre-send checklist

  1. Select the event date, not only today’s offset.
  2. Use a named IANA city zone for every participant.
  3. Compare the week before and after any displayed offset warning.
  4. Add UTC to important operational notices.
  5. Reconfirm when governments announce a rule change.

Method and primary references

Time-zone results use named IANA zones through the runtime’s internationalization engine. Weekend conventions are planning defaults, not legal advice. Announcement-dependent public holidays require confirmation.

IANA Time Zone Database ↗Unicode CLDR ↗ISO 8601 ↗