Dev & Computing · 时区偏移（Timezone Offset） · Updated 2026-10-25
What Is Timezone Offset?
Definition
An instant is a single point in time: timestamp 1,700,000,000 = 2023-11-14 22:13:20 UTC everywhere. A timezone is how that instant reads on local calendars: 2023-11-15 06:13 in Beijing, 2023-11-14 17:13 in New York. The engineering rule: store and transmit UTC (timestamps or ISO 8601 with Z) and convert to local zones only at display. Daylight saving breaks fixed offsets — US Eastern is UTC−5 in winter and UTC−4 in summer, so scheduling with a constant offset drifts half an hour.
Formula
Beijing = UTC + 8; New York (winter) = UTC − 5
Worked Example
For a "9 a.m. tomorrow" meeting across zones, store 2024-03-10T01:00:00Z (9 a.m. Beijing), not the literal "09:00" — your New York colleague sees 21:00 the previous day.
Common Misconception
"Timestamps don't need zone info" — a bare "2024-01-01 09:00" parses as local time on US or EU servers, shifting schedules 8-13 hours. And "China has no DST so it doesn't matter" — traveling users and overseas clients still trip the wire.
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