Travel and work guide

A reliable way to plan meetings across time zones

The safest invitation includes a date, a city-based time zone, and a calendar event that each person can verify locally.

Reviewed: July 2026 · 5 minute read

Start with cities, not abbreviations

Abbreviations such as CST, BST, or IST can be ambiguous. A city-based zone—such as America/New_York, Europe/London, or Europe/Paris—allows modern calendar software to apply local time rules for the selected date. In ordinary communication, writing “10:00 a.m. New York time” is often clearer than using a short code alone.

Why the date matters

Many regions change clocks seasonally, but they do not all change on the same day. For a few weeks each year, the usual time difference between North America and Europe may shift by one hour. Some locations do not observe seasonal clock changes at all. That is why a conversion based only on the typical difference can be wrong.

A four-step scheduling workflow

  1. Choose the meeting date first. Time-zone offsets can depend on that exact date.
  2. Select one reference location. Use the organizer's city or the location most participants already know.
  3. Check the local time for every participant. Look for unusually early or late hours, not just whether the conversion is technically correct.
  4. Send a calendar invitation. Include the reference time in the description and ask participants to confirm what appears on their calendar.

Example: New York, London, and Berlin

Instead of writing “meeting at 3 p.m.,” write a complete line such as “Meeting on 14 October at 3:00 p.m. New York time; please confirm the local time shown by your calendar.” This avoids guessing whether seasonal clock changes are active. It also gives everyone a single reference if calendar settings differ.

Make recurring meetings fair

A convenient time for one office can be a poor time for another. For a recurring international meeting, consider rotating between two time slots. Record the agreed working-hour boundaries for each participant and check them again when clocks change.

Before sending: verify the date, city-based zone, participant locations, and whether the meeting repeats across a clock-change date.

What the KokoroFlow converter is for

Our time-zone converter is useful for a quick comparison. For travel, legal deadlines, broadcasts, or important meetings, also verify the result in a current calendar or an authoritative time service. Local rules can change.