タイムゾーン全体でミーティングをスケジュールするのに最適な時間帯
この記事の全文は以下の英語版でご覧いただけます。
Scheduling a meeting across three or more time zones feels like herding cats — someone is always awake at 2 AM. The trick isn't finding a perfect hour (there often isn't one); it's finding the fairest hour and being consistent about it. Here's a practical framework.
The "Fair Window" Method
- List every participant's local working hours (typically 9 AM–5 PM, but adjust for culture — Spain eats lunch 2–4 PM, India works 9:30 AM–6:30 PM).
- Find the intersection. Plot each person's 9–5 on a 24-hour UTC timeline and shade the overlap.
- If no overlap exists, split the pain. Alternate meetings so the same person isn't always at 7 AM or 11 PM.
- Anchor to UTC. State the meeting as "14:00 UTC" so nobody does mental math wrong.
Example: San Francisco + London + Bangalore
| UTC | SF (PT) | London (GMT) | Bangalore (IST) |
|---|---|---|---|
| 08:00 | 12:00 AM | 8:00 AM | 1:30 PM |
| 09:00 | 1:00 AM | 9:00 AM | 2:30 PM |
| 10:00 | 2:00 AM | 10:00 AM | 3:30 PM |
| 16:00 | 8:00 AM | 4:00 PM | 9:30 PM |
| 17:00 | 9:00 AM | 5:00 PM | 10:30 PM |
The only humane slot is 16:00–17:00 UTC = 8–9 AM SF, 4–5 PM London, 9:30–10:30 PM Bangalore (Bangalore takes the late hit — rotate it next time).
Tools That Do the Math
- World Time Sync Meeting Planner — picks overlap automatically.
- World Clock — live side-by-side view of all zones.
- Calendar apps with timezone-aware invites (Google, Outlook).
Frequently Asked Questions
What's the best universal meeting time?
There isn't one for global teams. Aim for 14:00–17:00 UTC, which covers European afternoon + US morning + Asian late evening.
How do I schedule across 3 time zones fairly?
Plot each person's working hours on a UTC timeline, find the overlap, and rotate the "bad" slot if none exists.
Should I use UTC for invites?
Yes. "14:00 UTC" is unambiguous; "2 PM" is not.
What if there's zero overlap?
Asynchronous-first: record the meeting, use shared docs, and hold a short live sync at a rotating time.
Which tool finds the overlap for me?
Our Meeting Planner does it from any two cities.
Use our world clock and meeting planner for date-specific planning.
ユニバーサルミーティングの最適な時間は？
グローバルチームのためのものではありません。ヨーロッパの午後+米国の朝+アジアの深夜をカバーする14:00 – 17:00 UTCを目指しています。
3つのタイムゾーンを公平にスケジュールするにはどうすればよいですか？
各個人の勤務時間をUTCタイムラインにプロットし、オーバーラップを見つけ、存在しない場合は「不良」スロットを回転させます。
招待にUTCを使用する必要がありますか？
はい。「14:00 UTC」はあいまいではありませんが、「午後2時」はあいまいではありません。
オーバーラップがゼロの場合はどうなりますか？
非同期優先:ミーティングを録画し、共有ドキュメントを使用し、ローテーションしながら短いライブ同期を行います。
どのツールがオーバーラップを見つけますか？
私たちのミーティングプランナーは、2つの都市からそれを行います。