a tool for shared writing and social publishing
only use server tz on initial page load
Jared Pereira
(Oct 27, 2025, 4:34 PM EDT)
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src/hooks/useLocalizedDate.ts
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src/hooks/useLocalizedDate.ts
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import { useContext, useMemo } from "react";
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import { DateTime } from "luxon";
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import { RequestHeadersContext } from "components/Providers/RequestHeadersProvider";
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import { useInitialPageLoad } from "components/InitialPageLoadProvider";
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/**
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* Hook that formats a date string using Luxon with timezone and locale from request headers.
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* On initial page load, uses the timezone from request headers. After hydration, uses the system timezone.
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*
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* @param dateString - ISO date string to format
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* @param options - Intl.DateTimeFormatOptions for formatting
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options?: Intl.DateTimeFormatOptions,
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): string {
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const { timezone, language } = useContext(RequestHeadersContext);
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const isInitialPageLoad = useInitialPageLoad();
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return useMemo(() => {
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// Parse the date string to Luxon DateTime
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let dateTime = DateTime.fromISO(dateString);
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// On initial page load, use header timezone. After hydration, use system timezone
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const effectiveTimezone = isInitialPageLoad
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? timezone
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: Intl.DateTimeFormat().resolvedOptions().timeZone;
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// Apply timezone if available
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if (timezone) {
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dateTime = dateTime.setZone(timezone);
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if (effectiveTimezone) {
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dateTime = dateTime.setZone(effectiveTimezone);
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}
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// Parse locale from accept-language header (take first locale)
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const locale = language?.split(",")[0]?.split(";")[0]?.trim() || "en-US";
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return dateTime.toLocaleString(options, { locale });
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}, [dateString, options, timezone, language]);
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}, [dateString, options, timezone, language, isInitialPageLoad]);
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}