68 lines
2.2 KiB
TypeScript
68 lines
2.2 KiB
TypeScript
import {formatIsoToDisplay} from './dateFormat'
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const parseUtc = (iso: string): Date => {
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const [y, m, d] = iso.split('-').map(Number)
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return new Date(Date.UTC(y, m - 1, d))
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}
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const toIso = (d: Date): string => {
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const y = d.getUTCFullYear()
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const m = String(d.getUTCMonth() + 1).padStart(2, '0')
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const day = String(d.getUTCDate()).padStart(2, '0')
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return `${y}-${m}-${day}`
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}
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export function mondayOf(iso: string): string {
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const d = parseUtc(iso)
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const dayNum = d.getUTCDay() || 7 // dimanche = 7
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d.setUTCDate(d.getUTCDate() - (dayNum - 1))
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return toIso(d)
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}
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export function sundayOf(iso: string): string {
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const d = parseUtc(mondayOf(iso))
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d.setUTCDate(d.getUTCDate() + 6)
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return toIso(d)
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}
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export function toIsoWeek(iso: string): string {
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const d = parseUtc(iso)
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const dayNum = d.getUTCDay() || 7
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d.setUTCDate(d.getUTCDate() + 4 - dayNum) // jeudi de la semaine
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const isoYear = d.getUTCFullYear()
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const yearStart = new Date(Date.UTC(isoYear, 0, 1))
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const week = Math.ceil((((d.getTime() - yearStart.getTime()) / 86400000) + 1) / 7)
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return `${isoYear}-W${String(week).padStart(2, '0')}`
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}
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export function isoWeekToMonday(week: string): string | null {
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const m = /^(\d{4})-W(\d{2})$/.exec(week)
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if (!m) return null
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const year = Number(m[1])
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const w = Number(m[2])
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if (w < 1 || w > 53) return null
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// Lundi de la semaine 1 = lundi de la semaine contenant le 4 janvier
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const jan4 = new Date(Date.UTC(year, 0, 4))
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const jan4Day = jan4.getUTCDay() || 7
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const monday = new Date(jan4)
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monday.setUTCDate(jan4.getUTCDate() - (jan4Day - 1) + (w - 1) * 7)
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const iso = toIso(monday)
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// Garde-fou : la semaine 53 n'existe pas pour toutes les années
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if (toIsoWeek(iso) !== week) return null
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return iso
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}
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export function isValidIsoWeek(week: string): boolean {
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return isoWeekToMonday(week) !== null
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}
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export function formatWeekDisplay(week: string): string {
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const monday = isoWeekToMonday(week)
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if (!monday) return ''
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const sunday = sundayOf(monday)
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const w = Number(week.slice(6))
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const startDdMm = formatIsoToDisplay(monday).slice(0, 5) // "18/05"
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const endFull = formatIsoToDisplay(sunday) // "24/05/2026"
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return `Semaine ${w} (${startDdMm} → ${endFull})`
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}
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