Why some releases happen at midnight local time and others at a global time, and how to interpret announcements.
This guide focuses on practical steps you can use immediately—whether you’re scheduling a call, planning travel, or publishing a time on a website.
What this article covers
You’ll learn a repeatable approach that works across US states, countries, and DST transitions. The goal is simple: never guess and never rely on memory for offsets.
Midnight local vs global releases
Release times are announced in different ways:
- Midnight local time: each region gets the release at its own midnight.
- Single global moment: everyone gets it at the same instant, but the clock time differs by location.
When you see a release announcement, look for the time zone (ET/PT/UTC). If it’s missing, treat it as uncertain and confirm before planning a watch party.
The safest way to communicate time
When you publish time for other people:
- Include the date (not just the time).
- Include the time zone.
- Use a 24-hour clock or AM/PM with a clear label.
- If your audience spans regions, include a second reference zone.
When you schedule time for systems, store it as:
timestamp + IANA timezone(ortimestamp in UTC).
Troubleshooting checklist
- Is your device time zone set correctly?
- Are you looking at the right date after conversion?
- Does either location observe DST?
- Are you mixing abbreviations (EST) with IANA zones (America/New_York)?
- For recurring meetings: did DST change since the last meeting?
Frequently asked questions
- Do I need to include the date as well as the time? Yes—especially when conversions cross midnight.
- Is an abbreviation like “EST” always correct? Not always. Prefer
ETor an IANA time zone name. - What’s the fastest way to confirm accuracy? Open a converter and verify with the time zone name, not just the offset.
Quick checklist you can use today
- Write the date and time together.
- Add a time zone label.
- For international audiences, add a second zone or a converter.
- Re-check around DST weeks.
- For recurring events, let calendars handle conversion when possible.