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type { ITimezone, ITimezoneInfo, ITimezoneAbbreviation } from './types';\n\n/**\n * Get all available timezones\n * Bundle impact: ~20KB\n * @returns Promise resolving to array of all timezones\n */\nexport async function getTimezones(): Promise {\n const { default: timezones } = await import('./data/timezones.json');\n return timezones;\n}\n\n/**\n * Get timezones for a specific country\n * Bundle impact: ~2KB per country\n * @param countryCode - ISO 3166-1 alpha-2 country code (e.g., 'US', 'IN')\n * @returns Promise resolving to array of timezones for the country\n */\nexport async function getTimezonesByCountry(countryCode: string): Promise {\n try {\n const { default: timezones } = await import(`./data/by-country/${countryCode}.json`);\n return timezones;\n } catch (error) {\n console.error(`Timezones for country ${countryCode} not found`);\n return [];\n }\n}\n\n/**\n * Get timezone information including current time\n * @param timezoneName - IANA timezone name (e.g., 'America/New_York')\n * @returns Promise resolving to timezone info or null if not found\n */\nexport async function getTimezoneInfo(timezoneName: string): Promise {\n const timezones = await getTimezones();\n const timezone = timezones.find(tz => tz.zoneName === timezoneName);\n\n if (!timezone) {\n return null;\n }\n\n const now = new Date();\n\n // Check if DST is currently active by comparing offsets\n const january = new Date(now.getFullYear(), 0, 1);\n const july = new Date(now.getFullYear(), 6, 1);\n\n const janStr = january.toLocaleString('en-US', { timeZone: timezoneName });\n const julStr = july.toLocaleString('en-US', { timeZone: timezoneName });\n const nowStr = now.toLocaleString('en-US', { timeZone: timezoneName });\n\n const janOffset = new Date(janStr).getTimezoneOffset();\n const julOffset = new Date(julStr).getTimezoneOffset();\n const nowOffset = new Date(nowStr).getTimezoneOffset();\n\n // Standard time is when offset is maximum (most positive)\n const standardOffset = Math.max(janOffset, julOffset);\n const isDST = nowOffset < standardOffset;\n\n return {\n timezone: timezone.zoneName,\n currentTime: now.toISOString(),\n utcOffset: timezone.gmtOffsetName,\n isDST,\n gmtOffset: timezone.gmtOffset\n };\n}\n\n/**\n * Get all timezone abbreviations\n * Bundle impact: ~5KB\n * @returns Promise resolving to array of timezone abbreviations\n */\nexport async function getTimezoneAbbreviations(): Promise {\n const { default: abbreviations } = await import('./data/abbreviations.json');\n return abbreviations;\n}\n\n/**\n * Find timezone by abbreviation (e.g., 'EST', 'PST')\n * @param abbreviation - Timezone abbreviation\n * @returns Promise resolving to array of matching timezones\n */\nexport async function getTimezonesByAbbreviation(abbreviation: string): Promise {\n const abbrevs = await getTimezoneAbbreviations();\n const match = abbrevs.find(a => a.abbreviation.toLowerCase() === abbreviation.toLowerCase());\n \n if (!match) {\n return [];\n }\n\n const allTimezones = await getTimezones();\n return allTimezones.filter(tz => match.timezones.includes(tz.zoneName));\n}\n","import type { ITimezone, IConvertedTime } from './types';\nimport { getTimezones, getTimezoneInfo } from './loaders';\n\n/**\n * Convert time from one timezone to another\n * @param time - Time to convert (ISO string or Date object)\n * @param fromTimezone - Source timezone (IANA name)\n * @param toTimezone - Target timezone (IANA name)\n * @returns Promise resolving to converted time information\n */\nexport async function convertTime(\n time: string | Date,\n fromTimezone: string,\n toTimezone: string\n): Promise {\n const inputDate = typeof time === 'string' ? new Date(time) : time;\n\n // Format a date as a local ISO-like string (YYYY-MM-DDTHH:mm:ss) in the given timezone\n const formatInTZ = (date: Date, timezone: string): string => {\n const parts = new Intl.DateTimeFormat('en-CA', {\n timeZone: timezone,\n year: 'numeric',\n month: '2-digit',\n day: '2-digit',\n hour: '2-digit',\n minute: '2-digit',\n second: '2-digit',\n hour12: false,\n }).formatToParts(date);\n const get = (type: string) => parts.find((p) => p.type === type)?.value ?? '00';\n return `${get('year')}-${get('month')}-${get('day')}T${get('hour')}:${get('minute')}:${get('second')}`;\n };\n\n // Wall-clock strings in each timezone for computing the offset difference.\n // Parsing these locale strings as local time is wrong for absolute timestamps,\n // but the *difference* between the two wall-clock times always equals the\n // timezone-offset gap, regardless of the runtime's local timezone.\n const fromWall = inputDate.toLocaleString('en-US', { timeZone: fromTimezone });\n const toWall = inputDate.toLocaleString('en-US', { timeZone: toTimezone });\n const timeDiff =\n (new Date(toWall).getTime() - new Date(fromWall).getTime()) / (1000 * 60 * 60);\n\n return {\n originalTime: formatInTZ(inputDate, fromTimezone),\n fromTimezone,\n convertedTime: formatInTZ(inputDate, toTimezone),\n toTimezone,\n timeDifference: timeDiff,\n };\n}\n\n/**\n * Get current time in a specific timezone\n * @param timezoneName - IANA timezone name\n * @returns Promise resolving to current time as ISO string\n */\nexport async function getCurrentTime(timezoneName: string): Promise {\n const info = await getTimezoneInfo(timezoneName);\n if (!info) {\n throw new Error(`Timezone ${timezoneName} not found`);\n }\n return info.currentTime;\n}\n\n/**\n * Check if daylight saving time is currently active in a timezone\n * @param timezoneName - IANA timezone name\n * @param date - Optional date to check (defaults to now)\n * @returns Promise resolving to true if DST is active\n */\nexport async function isDaylightSaving(\n timezoneName: string,\n date: Date = new Date()\n): Promise {\n // Get offsets for January and July to determine standard time\n const year = date.getFullYear();\n const january = new Date(year, 0, 1);\n const july = new Date(year, 6, 1);\n \n const janStr = january.toLocaleString('en-US', { timeZone: timezoneName });\n const julStr = july.toLocaleString('en-US', { timeZone: timezoneName });\n const dateStr = date.toLocaleString('en-US', { timeZone: timezoneName });\n \n const janOffset = new Date(janStr).getTimezoneOffset();\n const julOffset = new Date(julStr).getTimezoneOffset();\n const dateOffset = new Date(dateStr).getTimezoneOffset();\n \n // Standard time is when offset is maximum (most positive)\n const standardOffset = Math.max(janOffset, julOffset);\n \n // DST is active when current offset is less than standard offset\n return dateOffset < standardOffset;\n}\n\n/**\n * Get GMT/UTC offset for a timezone in seconds\n * @param timezoneName - IANA timezone name\n * @returns Promise resolving to offset in seconds\n */\nexport async function getGMTOffset(timezoneName: string): Promise {\n const info = await getTimezoneInfo(timezoneName);\n if (!info) {\n throw new Error(`Timezone ${timezoneName} not found`);\n }\n return info.gmtOffset;\n}\n\n/**\n * Format GMT offset from seconds to string (e.g., \"UTC-05:00\")\n * @param offsetSeconds - Offset in seconds\n * @returns Formatted offset string\n */\nexport function formatGMTOffset(offsetSeconds: number): string {\n const hours = Math.floor(Math.abs(offsetSeconds) / 3600);\n const minutes = Math.floor((Math.abs(offsetSeconds) % 3600) / 60);\n const sign = offsetSeconds >= 0 ? '+' : '-';\n \n return `UTC${sign}${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}`;\n}\n\n/**\n * Validate if a timezone name is valid IANA timezone\n * @param timezoneName - Timezone name to validate\n * @returns Promise resolving to true if valid\n */\nexport async function isValidTimezone(timezoneName: string): Promise {\n const timezones = await getTimezones();\n return timezones.some(tz => tz.zoneName === timezoneName);\n}\n\n/**\n * Search timezones by name (partial match)\n * @param searchTerm - Search term\n * @returns Promise resolving to matching timezones\n */\nexport async function searchTimezones(searchTerm: string): Promise {\n const timezones = await getTimezones();\n const lowerSearch = searchTerm.toLowerCase();\n \n return timezones.filter(tz => \n tz.zoneName.toLowerCase().includes(lowerSearch) ||\n tz.tzName.toLowerCase().includes(lowerSearch) ||\n tz.abbreviation.toLowerCase().includes(lowerSearch)\n );\n}\n\n/**\n * Get all unique timezone abbreviations\n * @returns Promise resolving to array of unique abbreviations\n */\nexport async function getUniqueAbbreviations(): Promise {\n const timezones = await getTimezones();\n const abbreviations = new Set(timezones.map(tz => tz.abbreviation));\n return Array.from(abbreviations).sort();\n}\n\n/**\n * Get timezones by GMT offset\n * @param offsetSeconds - GMT offset in seconds\n * @returns Promise resolving to timezones with matching offset\n */\nexport async function getTimezonesByOffset(offsetSeconds: number): Promise {\n const timezones = await getTimezones();\n return timezones.filter(tz => tz.gmtOffset === offsetSeconds);\n}\n"]}