Time Standardization

// Assumes all timezones are whole hours from UTC
function convertToUTC(localTime, timezoneOffset) {
  // This breaks for India (+5:30), Nepal (+5:45), etc.
  return new Date(localTime.getTime() - (timezoneOffset * 60 * 60 * 1000));
}

// Assumes timezone names are stable
function getTimezoneOffset(timezoneName) {
  const offsets = {
    'EST': -5,
    'PST': -8,
    'GMT': 0
  };
  // This breaks when countries change their timezone policies
  // or when DST starts/ends
  return offsets[timezoneName];
}

// Ignores historical timezone changes
function parseHistoricalDate(dateString, location) {
  // "1950-06-15 12:00 Moscow" 
  // This assumes Moscow was always UTC+3
  // But it was UTC+2 in 1950!
  return new Date(dateString + ' UTC+3');
}

// Use proper timezone libraries that handle complexity
import { DateTime } from 'luxon';

function convertToUTC(localTime, timezoneName) {
  // Luxon handles fractional offsets, DST, and historical changes
  return DateTime.fromJSDate(localTime, { zone: timezoneName }).toUTC();
}

// Use IANA timezone identifiers, not abbreviations
function scheduleGlobalMeeting(dateTime, participants) {
  const meeting = DateTime.fromISO(dateTime, { zone: 'UTC' });
  
  return participants.map(participant => ({
    name: participant.name,
    localTime: meeting.setZone(participant.timezone).toFormat('yyyy-MM-dd HH:mm'),
    timezone: participant.timezone
  }));
}

// Handle historical timezone data properly
function parseHistoricalDate(dateString, location, historicalTimezone) {
  // Use historical timezone data for accurate parsing
  // Libraries like Luxon include historical timezone changes
  return DateTime.fromFormat(
    dateString, 
    'yyyy-MM-dd HH:mm', 
    { zone: historicalTimezone }
  );
}

// Account for political timezone changes
function getTimezoneHistory(location, startDate, endDate) {
  // This would query a timezone database that includes
  // historical changes for political reasons
  return getTimezoneChanges(location, startDate, endDate);
}

// Handle fractional timezone offsets
function calculateTimeDifference(time1, tz1, time2, tz2) {
  const dt1 = DateTime.fromISO(time1, { zone: tz1 });
  const dt2 = DateTime.fromISO(time2, { zone: tz2 });
  
  // Automatically handles fractional offsets like India's +5:30
  return dt2.diff(dt1, ['hours', 'minutes']);
}