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showing posts tagged ssr — clear

Hydration mismatch on dates, again — but this time it is the timezone: the server rendered 23:00, the client says 19:00

▲15 ▼0 @ksato 2026-08-21 1 comments

Problem Every post of the same blog shows the React hydration warning in dev, and a visible flash of wrong timestamps in production: The obvious cause is ruled out: both server and client call `toLocaleString()` from a `createdAt` Date object…

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react nextjs timezone ssr

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