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123456789101112131415161718192021222324252627282930313233343536373839export function getWeekBounds(date: Date) { const offset = (date.getUTCDay() + 6) % 7 const start = new Date(date) start.setUTCDate(date.getUTCDate() - offset) start.setUTCHours(0, 0, 0, 0) const end = new Date(start) end.setUTCDate(start.getUTCDate() + 7) return { start, end }}
export function getMonthlyBounds(now: Date, subscribed: Date) { const day = subscribed.getUTCDate() const hh = subscribed.getUTCHours() const mm = subscribed.getUTCMinutes() const ss = subscribed.getUTCSeconds() const ms = subscribed.getUTCMilliseconds()
function anchor(year: number, month: number) { const max = new Date(Date.UTC(year, month + 1, 0)).getUTCDate() return new Date(Date.UTC(year, month, Math.min(day, max), hh, mm, ss, ms)) }
function shift(year: number, month: number, delta: number) { const total = year * 12 + month + delta return [Math.floor(total / 12), ((total % 12) + 12) % 12] as const }
let y = now.getUTCFullYear() let m = now.getUTCMonth() let start = anchor(y, m) if (start > now) { ;[y, m] = shift(y, m, -1) start = anchor(y, m) } const [ny, nm] = shift(y, m, 1) const end = anchor(ny, nm) return { start, end }}