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Common time zone mistakes (and how to avoid them)

Seven frequent pitfalls—from 'EST' ambiguity to half-hour offsets—and fixes for each.

Última atualização: 2026-08-31

Mistakes we see often

Avoid these patterns when coordinating internationally:

  • Using abbreviations like CST or IST without a city—they map to multiple offsets.
  • Assuming every country observes DST because yours does.
  • Forgetting date rollovers on late-night calls across the Pacific.
  • Scheduling India with whole-hour math (UTC+5:30 breaks on-the-hour alignment).
  • Trusting a printed offset table from five years ago after policy changes.
  • Listing only 'US' or 'Russia' without a zone when multiple apply.
  • Setting recurring meetings once and never revisiting DST weeks.

Perguntas frequentes

What is the safest label in calendar invites?
City + IANA zone, e.g. '10:00 Europe/Madrid'.

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