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/** 业务时间统一按北京时间（Asia/Shanghai，无夏令时）处理。 */
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const SHANGHAI = 'Asia/Shanghai'
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function pad(n: number): string {
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return String(n).padStart(2, '0')
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}
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/**
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* API ISO / 任意可解析时间 → 日期时间选择器模型（北京时间 `YYYY-MM-DD HH:mm:ss`）。
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*/
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export function toShanghaiPickerValue(iso: string | null | undefined): string | null {
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if (!iso) return null
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const d = new Date(iso)
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if (Number.isNaN(d.getTime())) return null
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const parts = new Intl.DateTimeFormat('en-GB', {
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timeZone: SHANGHAI,
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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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second: '2-digit',
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hourCycle: 'h23',
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}).formatToParts(d)
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const get = (type: Intl.DateTimeFormatPartTypes): string =>
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parts.find((p) => p.type === type)?.value ?? '00'
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const hour = get('hour') === '24' ? '00' : get('hour')
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return `${get('year')}-${get('month')}-${get('day')} ${hour}:${get('minute')}:${get('second')}`
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}
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/**
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* 选择器值（按北京时间理解）→ API ISO8601（带偏移，避免被当成 UTC）。
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*/
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export function fromShanghaiPickerValue(s: string | null | undefined): string | null {
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const t = (s ?? '').trim()
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if (!t) return null
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const m = t.match(/^(\d{4})-(\d{2})-(\d{2})[ T](\d{2}):(\d{2})(?::(\d{2}))?/)
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if (!m) return null
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const [, y, mo, d, h, mi, sec = '00'] = m
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return `${y}-${mo}-${d}T${h}:${mi}:${sec}+08:00`
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}
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/** 列表/详情展示用北京时间。 */
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export function formatShanghaiDateTime(iso: string | null | undefined, empty = '—'): string {
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const v = toShanghaiPickerValue(iso)
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if (!v) return empty
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return v.replace(/:\d{2}$/, '') // YYYY-MM-DD HH:mm
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}
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export function formatShanghaiDateTimeFull(iso: string | null | undefined, empty = '—'): string {
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return toShanghaiPickerValue(iso) ?? empty
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}
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/** 调试/校验用 */
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export function shanghaiOffsetLabel(): string {
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return `${SHANGHAI} (UTC+8)`
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}
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export { pad }
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