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leanderandClaude Opus 5.5
5c612d995d
Event dates are stored as Oslo wall-clock strings, but were parsed in the server's local timezone, so times were only correct because the container sets TZ=Europe/Oslo. Move date parsing and formatting into lib/dates, interpret those strings as Oslo time, and also accept ISO timestamps in case the Studio writes them. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
68 lines
2.2 KiB
TypeScript
68 lines
2.2 KiB
TypeScript
import type { Locale } from "next-intl"
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const TIME_ZONE = "Europe/Oslo"
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// Event dates are usually stored as Oslo wall-clock time without an offset
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// ("2026-11-05 17:00"). The Studio's datetime field stores ISO timestamps
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// instead, so both formats have to be handled
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const LOCAL_DATE_FORMAT = /^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})$/
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const osloPartsFormatter = new Intl.DateTimeFormat("en-GB", {
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timeZone: TIME_ZONE,
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year: "numeric",
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month: "2-digit",
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day: "2-digit",
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hour: "2-digit",
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minute: "2-digit",
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hourCycle: "h23",
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})
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const getOsloParts = (date: Date) =>
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Object.fromEntries(
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osloPartsFormatter
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.formatToParts(date)
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.map(({ type, value }) => [type, value])
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)
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/** Formats a date as Oslo wall-clock time, e.g. "2026-11-05 17:00" */
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export const toOsloDateString = (date: Date) => {
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const { year, month, day, hour, minute } = getOsloParts(date)
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return `${year}-${month}-${day} ${hour}:${minute}`
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}
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// How far Oslo's clock is ahead of UTC at the given moment (1 or 2 hours)
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const getOsloOffset = (timestamp: number) => {
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const { year, month, day, hour, minute } = getOsloParts(new Date(timestamp))
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const osloAsUtc = Date.UTC(+year, +month - 1, +day, +hour, +minute)
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return osloAsUtc - Math.floor(timestamp / 60_000) * 60_000
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}
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/**
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* Parses an event date. Oslo wall-clock strings are interpreted in Oslo time
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* regardless of the server's timezone
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*/
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export const parseEventDate = (value: string) => {
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const match = value.match(LOCAL_DATE_FORMAT)
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if (!match) return new Date(value)
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const [year, month, day, hour, minute] = match.slice(1).map(Number)
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const wallClockAsUtc = Date.UTC(year, month - 1, day, hour, minute)
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// The offset depends on daylight saving time at the resulting moment, so
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// guess with the offset at the wall-clock time, then correct
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const guess = wallClockAsUtc - getOsloOffset(wallClockAsUtc)
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return new Date(wallClockAsUtc - getOsloOffset(guess))
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}
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/** Formats an event date like "torsdag 5. november 2026 kl. 17:00" */
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export const formatEventDate = (value: string, locale: Locale) =>
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parseEventDate(value).toLocaleString(locale, {
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weekday: "long",
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month: "long",
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year: "numeric",
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day: "numeric",
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hour: "numeric",
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minute: "2-digit",
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timeZone: TIME_ZONE,
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})
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