mirror of
https://github.com/Since-3/since3-portal.git
synced 2026-10-12 21:41:16 +00:00
38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
"use client"
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import { useSyncExternalStore } from "react"
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function subscribe(onChange: () => void) {
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const timer = setInterval(onChange, 1000)
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return () => clearInterval(timer)
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}
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// Aktuelle Zeit im Sekundentakt; auf dem Server null, damit nichts beim Hydrieren abweicht
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export function useNow() {
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return useSyncExternalStore(subscribe, () => Math.floor(Date.now() / 1000) * 1000, () => null)
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}
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// "2026-11-30" gilt bis Tagesende (lokale Zeit), "2026-11-19T09:00" ab genau dieser Uhrzeit
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export function useCountdown(target: string) {
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const now = useNow()
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const end = Date.parse(/^\d{4}-\d{2}-\d{2}$/.test(target) ? `${target}T23:59:59` : target)
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if (now === null || Number.isNaN(end)) return null
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const diff = Math.max(0, end - now)
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return {
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days: Math.floor(diff / 86_400_000),
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hours: Math.floor(diff / 3_600_000) % 24,
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minutes: Math.floor(diff / 60_000) % 60,
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seconds: Math.floor(diff / 1000) % 60,
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done: diff === 0,
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}
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}
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// "08:30" → Minuten seit Mitternacht, sonst null
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export function minutesOf(time: string) {
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const match = time.trim().match(/^(\d{1,2}):(\d{2})$/)
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return match ? Number(match[1]) * 60 + Number(match[2]) : null
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}
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export const splitList = (value: string, separator: string | RegExp = ",") =>
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value.split(separator).map((part) => part.trim()).filter(Boolean)
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