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| // Copyright (c) 2024 The Brave Authors. All rights reserved. | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
| // You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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| import { useEffect, useState } from "react" | ||
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| // Set numeric to auto so we get 'yesterday' instead of '1 day ago' | ||
| const rtf = new Intl.RelativeTimeFormat(undefined, { | ||
| numeric: 'auto' | ||
| }) | ||
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| const second = 1000 | ||
| const minute = 60 * second | ||
| const hour = 60 * minute | ||
| const day = 24 * hour | ||
| const week = 7 * day | ||
| const year = 365 * day | ||
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| const durations = { | ||
| second, minute, hour, day, week, year | ||
| } | ||
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| // Formats a time relative to now as the rounded number of units. | ||
| export const getRelativeTime = (time: Date | number) => { | ||
| const now = Date.now() | ||
| const then = new Date(time).getTime() | ||
| const diff = then - now | ||
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| const [unit, duration] = (Object.entries(durations) as any).findLast(([, duration]: [string, number]) => Math.abs(diff) > duration) ?? ['second', 1000] | ||
| const amount = Math.floor(diff / duration) | ||
| return { | ||
| formatted: rtf.format(amount, unit ), | ||
| updatesIn: duration - (Math.abs(diff - amount)), | ||
| } | ||
| } | ||
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| export default function useRelativeTime(time: Date | number) { | ||
| const [formatted, setFormatted] = useState('') | ||
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| useEffect(() => { | ||
| if (!time) return | ||
| let timeout: NodeJS.Timeout | ||
| const update = () => { | ||
| const { formatted, updatesIn } = getRelativeTime(time) | ||
| setFormatted(formatted) | ||
| setTimeout(update, updatesIn) | ||
| } | ||
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| update() | ||
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| return () => { | ||
| clearTimeout(timeout) | ||
| } | ||
| }, [time]) | ||
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| return formatted | ||
| } |