60 lines
2.2 KiB
TypeScript
60 lines
2.2 KiB
TypeScript
import { type ClassValue, clsx } from "clsx"
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import { twMerge } from "tailwind-merge"
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const TIMEZONE = "Asia/Shanghai"
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export function cn(...inputs: ClassValue[]) {
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return twMerge(clsx(inputs))
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}
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function getShanghaiOffsetMs(): number {
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const formatter = new Intl.DateTimeFormat("en-US", {
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timeZone: TIMEZONE,
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timeZoneName: "short",
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})
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const parts = formatter.formatToParts(new Date())
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const tzPart = parts.find((p) => p.type === "timeZoneName")
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if (!tzPart) return 8 * 60 * 60 * 1000
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const match = tzPart.value.match(/^([+-])(\d{2}):?(\d{2})$/)
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if (!match) return 8 * 60 * 60 * 1000
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const sign = match[1] === "+" ? 1 : -1
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const offsetHours = parseInt(match[2], 10)
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const offsetMinutes = parseInt(match[3], 10)
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return sign * (offsetHours * 60 + offsetMinutes) * 60 * 1000
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}
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export function formatDateForDatetimeLocal(date: Date): string {
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const shanghaiOffsetMs = getShanghaiOffsetMs()
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const localTimeMs = date.getTime() + shanghaiOffsetMs
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const localDate = new Date(localTimeMs)
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const year = localDate.getUTCFullYear()
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const month = String(localDate.getUTCMonth() + 1).padStart(2, "0")
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const day = String(localDate.getUTCDate()).padStart(2, "0")
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const hours = String(localDate.getUTCHours()).padStart(2, "0")
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const minutes = String(localDate.getUTCMinutes()).padStart(2, "0")
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return `${year}-${month}-${day}T${hours}:${minutes}`
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}
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export function parseDateTimeLocalToUTC_v2(year: number, month: number, day: number, hours: number, minutes: number): Date {
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const localTimeMs = Date.UTC(year, month, day, hours, minutes)
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const shanghaiOffsetMs = getShanghaiOffsetMs()
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const utcMs = localTimeMs - shanghaiOffsetMs
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return new Date(utcMs)
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}
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export function parseDateTimeLocalToUTC(value: string): Date | null {
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if (!value) return null
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const [datePart, timePart] = value.split("T")
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if (!datePart) return null
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const [y, m, d] = datePart.split("-").map(Number)
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const [h = 0, min = 0] = timePart ? timePart.split(":").map(Number) : [0, 0]
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return parseDateTimeLocalToUTC_v2(y, m - 1, d, h, min)
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}
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export function nowInShanghai(): Date {
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const shanghaiOffsetMs = getShanghaiOffsetMs()
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return new Date(Date.now() + shanghaiOffsetMs)
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} |