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How to use these time zone resources

The links below group external references by purpose. A few notes on when each is worth reaching for:

• For a reliable IANA zone identifier to use in code or an API, treat the IANA database as the source of truth. Avoid fixed UTC offsets such as "UTC+2", which ignore daylight saving and will be wrong twice a year.
• When you need the current time somewhere, the live world clock is faster than any reference table, because it accounts for today's offset rather than a generic one.
• When scheduling, daylight saving transitions in March and October are the most common cause of a meeting landing an hour off. Confirm each participant's zone on the day rather than assuming.