11847a1af0
POSIX-style TZ strings like IST-2 cause a hard RangeError crash in formatMessages because Intl.DateTimeFormat only accepts IANA identifiers. - Add isValidTimezone/resolveTimezone helpers to src/timezone.ts - Make formatLocalTime fall back to UTC on invalid timezone - Validate TZ candidates in config.ts before accepting - Add timezone setup step to detect and prompt when autodetection fails - Use node:22-slim in Dockerfile (node:24-slim Trixie package renames) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
38 lines
947 B
TypeScript
38 lines
947 B
TypeScript
/**
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* Check whether a timezone string is a valid IANA identifier
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* that Intl.DateTimeFormat can use.
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*/
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export function isValidTimezone(tz: string): boolean {
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try {
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Intl.DateTimeFormat(undefined, { timeZone: tz });
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return true;
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} catch {
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return false;
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}
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}
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/**
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* Return the given timezone if valid IANA, otherwise fall back to UTC.
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*/
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export function resolveTimezone(tz: string): string {
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return isValidTimezone(tz) ? tz : 'UTC';
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}
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/**
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* Convert a UTC ISO timestamp to a localized display string.
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* Uses the Intl API (no external dependencies).
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* Falls back to UTC if the timezone is invalid.
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*/
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export function formatLocalTime(utcIso: string, timezone: string): string {
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const date = new Date(utcIso);
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return date.toLocaleString('en-US', {
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timeZone: resolveTimezone(timezone),
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year: 'numeric',
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month: 'short',
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day: 'numeric',
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hour: 'numeric',
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minute: '2-digit',
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hour12: true,
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});
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}
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