fix(ui): 修复全局时区偏移问题与日期控件手动输入崩溃 Bug

src/libs/utils.ts

@@ -1,6 +1,79 @@
 import { type ClassValue, clsx } from "clsx"
 import { twMerge } from "tailwind-merge"
+import { toZonedTime, fromZonedTime } from "date-fns-tz"
+
+const TIMEZONE = "Asia/Shanghai"
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
+}
+
+export function nowInShanghai(): Date {
+  const now = new Date()
+  const utcStr = now.toLocaleString("en-US", { timeZone: "UTC" })
+  const utcDate = new Date(utcStr)
+  const shanghaiOffset = getTimezoneOffset("Asia/Shanghai")
+  const utcOffset = 0
+  return new Date(utcDate.getTime() + (shanghaiOffset - utcOffset))
+}
+
+export function formatDateForDatetimeLocal(date: Date): string {
+  const zoned = toZonedTime(date, TIMEZONE)
+  const year = zoned.getFullYear()
+  const month = String(zoned.getMonth() + 1).padStart(2, "0")
+  const day = String(zoned.getDate()).padStart(2, "0")
+  const hours = String(zoned.getHours()).padStart(2, "0")
+  const minutes = String(zoned.getMinutes()).padStart(2, "0")
+  return `${year}-${month}-${day}T${hours}:${minutes}`
+}
+
+function getTimezoneOffset(timezone: string): number {
+  const formatter = new Intl.DateTimeFormat("en-US", {
+    timeZone: timezone,
+    timeZoneName: "longOffset",
+  })
+  const parts = formatter.formatToParts(new Date())
+  const tzPart = parts.find((p) => p.type === "timeZoneName")
+  if (!tzPart) return 0
+  const match = tzPart.value.match(/([+-]?\d{1,2}):?(\d{2})/)
+  if (!match) return 0
+  const hours = parseInt(match[1], 10)
+  const minutes = parseInt(match[2], 10)
+  return (hours * 60 + minutes) * 60 * 1000
+}
+
+export function parseDateTimeLocalToUTC(value: string): Date | null {
+  if (!value) return null
+  const zoned = fromZonedTime(value, TIMEZONE)
+  return zoned
+}
+
+export function parseDateTimeLocalToUTC_v2(year: number, month: number, day: number, hours: number, minutes: number): Date {
+  const shanghaiTime = new Date()
+  shanghaiTime.setFullYear(year)
+  shanghaiTime.setMonth(month)
+  shanghaiTime.setDate(day)
+  shanghaiTime.setHours(hours, minutes, 0, 0)
+
+  const shanghaiOffsetMs = getShanghaiOffsetMs(shanghaiTime)
+  const utcMs = shanghaiTime.getTime() - shanghaiOffsetMs
+  return new Date(utcMs)
+}
+
+function getShanghaiOffsetMs(date: Date): number {
+  const formatter = new Intl.DateTimeFormat("en-US", {
+    timeZone: "Asia/Shanghai",
+    timeZoneName: "short",
+  })
+  const parts = formatter.formatToParts(date)
+  const tzPart = parts.find((p) => p.type === "timeZoneName")
+  if (!tzPart) return 8 * 60 * 60 * 1000
+
+  const match = tzPart.value.match(/([+-])(\d{2}):?(\d{2})/)
+  if (!match) return 8 * 60 * 60 * 1000
+
+  const sign = match[1] === "+" ? 1 : -1
+  const offsetHours = parseInt(match[2], 10)
+  const offsetMinutes = parseInt(match[3], 10)
+  return sign * (offsetHours * 60 + offsetMinutes) * 60 * 1000
 }