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{ toZonedTime, fromZonedTime, formatInTimeZone } from \"date-fns-tz\";\nimport type { ConvertTimezoneOptions } from \"@multisystemsuite/timezone-engine-shared-types\";\nimport { memoize, TimezoneCache } from \"@multisystemsuite/timezone-engine-utils\";\n\nconst conversionCache = new TimezoneCache();\n\nfunction toDate(input: Date | string | number): Date {\n if (input instanceof Date) return input;\n return new Date(input);\n}\n\n/** Convert date to UTC */\nexport function toUTC(date: Date | string | number, sourceTimezone: string): Date {\n const d = toDate(date);\n return fromZonedTime(d, sourceTimezone);\n}\n\n/** Convert UTC date to target timezone representation */\nexport function fromUTC(date: Date | string | number, targetTimezone: string): Date {\n const d = toDate(date);\n return toZonedTime(d, targetTimezone);\n}\n\n/** Convert date between timezones */\nexport function convertTimezone(options: ConvertTimezoneOptions): Date {\n const { sourceTimezone, targetTimezone, date = new Date() } = options;\n const utcDate = toUTC(date, sourceTimezone);\n return fromUTC(utcDate, targetTimezone);\n}\n\nconst memoizedConvert = memoize(\n (sourceTimezone: string, targetTimezone: string, timestamp: number) =>\n convertTimezone({ sourceTimezone, targetTimezone, date: new Date(timestamp) }),\n (source, target, ts) => `${source}:${target}:${ts}`,\n conversionCache,\n);\n\n/** Cached timezone conversion for high-performance scenarios */\nexport function convertTimezoneCached(\n sourceTimezone: string,\n targetTimezone: string,\n date: Date | string | number = new Date(),\n): Date {\n return memoizedConvert(sourceTimezone, targetTimezone, toDate(date).getTime());\n}\n\n/** Detect if DST is active for a timezone at a given date */\nexport function detectDST(timezone: string, date: Date | string | number = new Date()): boolean {\n const d = toDate(date);\n const jan = new Date(d.getFullYear(), 0, 1);\n const jul = new Date(d.getFullYear(), 6, 1);\n\n const janOffset = getTimezoneOffsetMinutes(timezone, jan);\n const julOffset = getTimezoneOffsetMinutes(timezone, jul);\n const currentOffset = getTimezoneOffsetMinutes(timezone, d);\n\n if (janOffset === julOffset) return false;\n return currentOffset !== Math.max(janOffset, julOffset);\n}\n\n/** Get UTC offset string for a timezone (e.g. \"+05:30\") */\nexport function getUtcOffset(timezone: string, date: Date | string | number = new Date()): string {\n const d = toDate(date);\n const formatted = formatInTimeZone(d, timezone, \"xxx\");\n return formatted;\n}\n\n/** Get offset in minutes from UTC */\nexport function getTimezoneOffsetMinutes(\n timezone: string,\n date: Date | string | number = new Date(),\n): number {\n const d = toDate(date);\n const utcDate = toUTC(d, timezone);\n return (utcDate.getTime() - d.getTime()) / 60_000;\n}\n","import { formatInTimeZone } from \"date-fns-tz\";\nimport type { WorldClockEntry } from \"@multisystemsuite/timezone-engine-shared-types\";\nimport { getTimezoneInfo, listAllTimezones } from \"@multisystemsuite/timezone-engine-world-data\";\nimport { detectDST, getUtcOffset } from \"./conversion.js\";\n\nfunction buildClockEntry(timezone: string, label: string, now: Date): WorldClockEntry {\n const info = getTimezoneInfo(timezone);\n const formattedTime = formatInTimeZone(now, timezone, \"PPpp\");\n const utcOffset = getUtcOffset(timezone, now);\n const isDST = detectDST(timezone, now);\n\n return {\n timezone,\n label: label || info?.city || timezone,\n localTime: now,\n formattedTime,\n utcOffset,\n isDST,\n };\n}\n\n/** Get world clock for a single timezone */\nexport function getWorldClockTime(\n timezone: string,\n label?: string,\n now: Date = new Date(),\n): WorldClockEntry {\n return buildClockEntry(timezone, label ?? timezone, now);\n}\n\n/** Get world clock for multiple timezones */\nexport function getWorldClock(timezones: string[], now: Date = new Date()): WorldClockEntry[] {\n return timezones.map((tz) => buildClockEntry(tz, tz, now));\n}\n\n/** Get default world clock with major cities */\nexport function getDefaultWorldClock(now: Date = new Date()): WorldClockEntry[] {\n const defaults = [\n \"UTC\",\n \"America/New_York\",\n \"Europe/London\",\n \"Asia/Kolkata\",\n \"Asia/Tokyo\",\n \"Australia/Sydney\",\n ];\n return getWorldClock(defaults, now);\n}\n\n/** Get all registered world clock entries */\nexport function getFullWorldClock(now: Date = new Date()): WorldClockEntry[] {\n return getWorldClock(listAllTimezones(), now);\n}\n\n/** Create a live clock updater callback */\nexport function createLiveClockUpdater(\n timezones: string[],\n onUpdate: (clocks: WorldClockEntry[]) => void,\n intervalMs = 1000,\n): { start: () => void; stop: () => void } {\n let timerId: ReturnType | undefined;\n\n const tick = () => {\n onUpdate(getWorldClock(timezones));\n };\n\n return {\n start: () => {\n tick();\n timerId = setInterval(tick, intervalMs);\n },\n stop: () => {\n if (timerId !== undefined) {\n clearInterval(timerId);\n timerId = undefined;\n }\n },\n };\n}\n"]}